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Originally Posted by papiichuulo
I am working on an '89 model 1500 w/ a 305cu. and a 5-spd. On cold start (mornings) the engine just doesnt want to run. If you ease on the gas/accelerator, it will gently try to get up to speed. But if you try to "rush" her and give her a little more gas, then she starts bucking and missing, backfiring.... that is until you let off the gas and ease back into it. After you run it for about 10 maybe 15 minutes, it'll start running pretty good. We have checked and replaced.... the dist. cap and rotor, ign. wires. sp. plugs, IAC motor (broken spring), temp. sender (cracked plastic) and connector (broken wire)....... I was almost sure that the tune-up with new temp. sender would take care of it, but apparently not... I am wondering about the O2 sensor now.... I dont have access to a pre-OBD II scan tool at the moment.... Any suggestions?
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If it's backfiring then for sure it is an electrical problem , try a new coil. O2 sensor will only cause a high idle , you can also look at the egr by disconnectig the hose (plug it and drive it).