Hello,
I am struggling with an issue with my 1983 GMC Sierra 5.7. I recently replaced the fuel filter, spark plugs, plug wires, diz cap, rotor, O2 sensor, HEI module, most vaccuum lines, and i still cant get this thing idling smooth when hot.
thing is, when cold and first started it runs good. then as the choke is off it runs like a dog and wants to shake. if i give it gas it runs better so it seems worst at idle under load like at stop sign.
any ideas? Im thinking of trying the coil next or pcv valve? i'm just throwing money at it now. i jumped the a/b obd1 terminal last night and there was a code 13 so i did the 02 sensor. which was dirty but made no difference.
any ideas?