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knutrockney77
03-08-2010, 04:15 PM
I have a 89 5-speed, and I have noticed when I shift to 4th and accelerate, the engine seems to hesitate and buck until I let up a little or gradually accelerate, anyone know what this problem could be? no problem in any other gear when accelerating.

sts70004
03-09-2010, 01:15 AM
I have a 89 5-speed, and I have noticed when I shift to 4th and accelerate, the engine seems to hesitate and buck until I let up a little or gradually accelerate, anyone know what this problem could be? no problem in any other gear when accelerating.

Only when in 4th? Mine would do that in any gear when my spark plug wires went bad.

knutrockney77
03-09-2010, 10:30 AM
yes, only in 4th, I can accelerate as much as I want in any other gear and it wont hesitate.

Breadsax
03-09-2010, 12:55 PM
Mine also did that until I changed plug wires. It was most noticeable in higher gears like fourth and fifth and usually at the low end of the power band with WOT.

sts70004
03-09-2010, 09:09 PM
I would start with spark plugs and wires. They're pretty cheap after all. I think fuel pressure issues can cause that problem as well, and you can check the pressure at rail pretty easily.