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Hello Friends,
My name is Greg and I am new to this group and I am glad to be here with other like minded people. I own a 1994 Mercury Cougar XR7 with 84,000, miles on it, It was mint when I bought it 7 years ago , but sadly it is a everyday driver and it has its share of scratches... Anyhow even though the car is almost 20 years old , it is still new to me regarding the mechanics of the car..Here is my question, My car has a problem as when I leave off of the gas at any speed , the engine misses and stumbles, and at idle the engine misses and has a very rough idel. I already changed the plugs the , wires , cap and rotor and I set the timing. The car still runs very rough. Could it be dirty fuel injectors any help in resolving this problem ,or things I could check would be greatly appreciated
Respectfully and GOD BLESS From Greg:)
 

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first thing is to buy a tamperproof T20 torx bit and remove the maf meter from the housing. This way you can inspect the two wires on it and clean with MAF cleaner spray/electrical parts cleaner. Next cheapest/easiest thing to do is to change the fuel filter, since you didn't mention you had changed it. Then we can proceed from there.
 

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what about vacuum leaks, and IAC valve operation.
yep at this point it could be pretty much anything. Based on his initial post, he would likely be lost if we told him to check vacuum leaks at this point, although he can if he feels so inclined obviously. Until he starts to learn about his car and actually pokes around at all the other things he hasn't touched, we'll just have to sit back and wait.
 

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Hello and thank you for everybody that responded and all of the great tech advice for my mercury. For starters tomorrow I am going to replace my fuel filter that to me sounds like a great start and also to clean and inspect the two wires that Guitar Maestro mentioned. Hopefully this will work and If not I will move on to the next thing to check. I really enjoy this car a lot and plan to keep it on the road for many more years. Thanks to everbody and I will keep you posted on how this works for me.... have a great Day.........From Greg:)
 

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Don't really mean to thread jack, but this sounds like a similar problem on my 94 xr7. just bought it and the MAF sensor is unplugged, plugging it back in cause a very rough idle and almost no power. Should I start be cleaning the wires or attempt something else first?
 

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yep, if those MAF wires are super dirty, hit em with some windex, and DELICATELY, rub them with a Qtip. make sure not to bend them in any way.



if all else fails, you may have to buy a new one. be warned, do not buy any of the parts store specials, go straight to ford and you will be much happier with the results.
 

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So I cleaned the MAF with some MAF cleaner, and it solved the roiugh idle, but there is still a major lack in power? Time to get a new one or...?
 

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So I cleaned the MAF with some MAF cleaner, and it solved the roiugh idle, but there is still a major lack in power? Time to get a new one or...?
MAJOR lack of power? Hmmm... sounds like a head gasket blew at some spot and you are leaking pressure. Any other symptoms? Do you smell coolant leaking? Are any of the spark plugs gummed up?

Could be a lot of things. What symptoms are you having with your MAJOR lack of power?
 

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The car still runs very rough. Could it be dirty fuel injectors any help in resolving this problem ,or things I could check would be greatly appreciated
Respectfully and GOD BLESS From Greg:)
I would run codes as well to see what else might be wrong. You can have your local auto parts store do it for free.
 

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I know you said you set the timing, but did you pull the spout plug first? and if so is it actually advancing your timing with the spout plug in? that would cause a lack of power
 

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Ok change in info, I took another look at the MAF after I cleaned it, and I noticed the pieces on the wires were darker than the wires, so I used the qtip idea with the MAF cleaner. It took a bit of scrubbing to get them clean, but now it runs great. Still feels like it should be faster, but then again I am coming from a 200 HP car to one with 140 HP, so I guess it will feel lacking in the power department.
 
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