Truck is bucking

08STEPHEN52

MEMBER
1998 CHEVROLET TRUCK
5.7L
V8
4WD
AUTOMATIC
225,000 MILES

After truck warms up, at light throttle or when I let off, the truck will buck hard one time, and then resume normally. This will happen every few miles. No codes in the computer. No sign of current interruption that I can find. I have re-manufactured the transmission, installed a new distributor, wires and plugs. Checked the coil, MAP, MAF and TPS. It runs better, but still bucks. Help

3 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good morning,

It sounds like you may have a power interruption in the electrical system.

I would start by cleaning the battery cables to be sure there is no corrosion.

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

The ignition switch is another possibility as well.

Roy

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Friday, December 14th, 2018 AT 6:00 AM

08STEPHEN52

MEMBER
2 POSTS

Thanks. But I forgot to mention that new battery bolts, terminal cleaning and cleaning on the other end has been done and I have checked ignition switch for power interruption, without finding anything. Also, when I say the trans was re-manufactured, I'm talking about new solenoids, new internal wiring harness, new torque converter, everything. Very frustrated.

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Friday, December 14th, 2018 AT 6:17 AM

ASEMASTER6371