Okay here’s the deal. I’ve got a 1994 ZR2 CPI. Over the course of the past two weeks I’ve installed new distributor, fuel pump, both knock sensors, injector assembly, fuel filter, knuckle kit, egr block off plate, motor mounts, temp sensor, spark plugs, wires, upper and lower intake gaskets. Engine still has an excessive shake to it and will sometimes pop/cough out of the intake. My “service engine soon” light keeps blinking with no codes being thrown. Truck odometer reads 315K. I’m really tired of playing the guessing game. If I were to do a junkyard 4.3 swap, what engines should I look for? I’m willing to swap over my CPI intake on the new engine to keep it factory. What 4.3 should I use? It’ll only be the block/heads and internals I’ll be using. I feel like my current engine has internal issues. This swap transition will also give me a chance to refresh my transmission.