Hesitation under load
Got a problem ive had for a couple months now. My 94 LeSabre has a bad hesitation or "bog" when under a load. It will NOT do this in Park or Neutral! If im at a dead stop and put it to the floor(i dont beat on the car, this is just to verify symptoms), it chuggs along and bucks. 1/4 throttle from a stop it will accelerate OK, but does have hesitation. Its the worst when already moving. If driving on the highway aroun 60mph in OD, heres what i get. If at this speed i give it 1/4 pedal to accelerate, the engine feels like its going to fall out of the car!(not literally, but the whole car bucks and shakes VERY badly). If i got 1/2 to 3/4 pedal at the same speed and get a Downshift, the car pulls but with a minor hesitation. Same thing from 40mph. It seems like when under a load its the worste(high gear, low rpm, when giving more fuel). But does do it from a stop. Ive also heard a "popping" noise which sounds like its coming from the air intake when this is happening? Again, i cant verify noise/location as it only does this while driving. What should I do/check? I really dont want to start thowing parts at it on a whim, hoping somebody else has had the same issue? Thanks guys.. -Paul
Also, I disco'd the MAF today to see if it was potentially related, but the symptons continued. MAF has been replaced, and I replaced the plugs & wires 25k ago. Coolant flush at same time. EGR valve has also been replaced. Car is a DD and doesnt get beat on.. Thanks for any help!