Truck is bucking

1998 CHEVROLET TRUCK
225,000 MILES • 5.7L • V8 • 4WD • AUTOMATIC
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08STEPHEN52
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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
Dec 14, 2018 at 5:15 AM
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ASEMASTER6371
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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

Dec 14, 2018 at 6:00 AM
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08STEPHEN52
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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.
Dec 14, 2018 at 6:17 AM
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ASEMASTER6371
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Then I would check all your connections related to the ignition system for any corrosion or terminal damage.

Roy
Dec 14, 2018 at 6:26 AM