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Hello all...I have a 1994 Thunderbird with the 4.6L V8. My car will not idle at the proper RPM. The idle is too low, at approximately 600 RPM. If I try to turn on the A/C the car stalls. I changed the I.A.C. valve, spark plugs (gap 0.52), and cleaned out the throttle valve but there has been no change. I was and still am getting a check engine light.

Does anyone have any suggestions?

Thank you in advance.
 

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check to see what the check engine code is first and go from there...

there are sensors you can clean with throttlebody/intake cleaner to make it perform better.
 

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DPFE sensor i bet
 
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