dncastillo0728

Good evening my fellow chevy friends. I seem to have an issue and no better place to go than here. I have a 1993 Chevy 1500 extended cab with 5.7 liter and automatic transmission. Seems like when I put it in to drive and start accelerating slowly, the truck seems to buckle. Like jumping but continuing to move. RPS go up and down until it shifts. IF I take off fast, it does not happen. This is driving me nuts. Can someone help? I have looked history but don't find anything. I put new IAC Vale but the same. Have checked the vacuum lines and nothing.


Please help

Jeepwalker

Double-check all vacuum lines, especially to the PCV. Quadruple-check PVC. It could be ignition so double-check your ignition wires/plugs/cap. Cap might be really crusty underneath at the pins inside the distributor cap. Also check the distributor wires inside the distributor. I went through that recently. The wires at the Hall-Effect sensor were cracked and worse yet, the connectors to the ignition module were badly corroded, I mean badly corroded (I could hardly remove the plug!). Also do a check of the temp sensor next to the radiator hose outlet (top of motor). Ohm it out and compare to a chart (google it), it might have drifted and it CAN do what you described. Good luck

dncastillo0728

I took off the cap and rotor and a little crusty. I get those tomorrow. WIll try that. Also, under the cap it a brown piece, don't know what that is. Do you? It is round right under rotor? That looks a bit weird. Not stable.

dncastillo0728

The truck has no misfire, just feels like it goes into gear and then back out. So it like surges and relaxes again then back again.