ok guys, 97 bird with 4.6l. i got in a wreck in january and all has been fine besides a evap leak cause it busted the canister. a week ago the car starts to have a misfire on #8. the car runs great until it is warmed up and goes into closed loop. if i keep it in its "happy zone" around 1500 to 2500rpm it seems fine but you can still tell its misfiring. below 1500 its shakes it chugs it idles bad and accelerating can sometimes come with a clunk from the engine. but once your past it runs ok. Any ideas?