well here is the prob. i put on new iridium plugs and wires yesterday and took the car for a ride.. all was well, the car actually ran better.. then later on i went back out.. the car ran like crap.. the car would shake/vibrate back and forth pretty violently... the motor would accelerate and go faster but as if the motor was struggling or something was holding it back.. then after 5200 rpm or so the car would run normally?? wtf???? i was thinking tranny but it does that vibrate thing in all gears?? so please help me... i am in west virginia by pittsburgh and eastern ohio.. any shop or help i can check would be great

 

maybe try switching your plugs and wires back and going for a ride??

 

did you do any mods to your clutch or flywheel?