My 97 S10 with 75k miles started running rough….hesitating…bucking…in the last 3 months I replaced
1) plugs and wires
2) fuel filter
3) cap and rotor
4) Mass airflow sensor
5) Coil

it kept behaving badly and stalled a few times and then stalled and wouldn’t start…it was kicking off code 0300 (thanks that helped a lot). LOL

So I replaced
6) fuel pump

I’m Getting 60-65 PSI fuel pressure from the new pump even jumped the pump to make sure it was getting fuel.

i haven't replaced the ignition module yet or the ECM.

Any suggestions? Thanks!

most of the stuff was preventive maintenance or due ~75k miles and I’ve only spent about $200 and a bunch of swearing…

I swapped the 3 modules in the glovebox around too to see it there was a bad one!

 

Likely the ignition module yet or the ECM like you mentioned.

 

okay replaced ignition module and it starts, but any pressing of the accelerator and ITS ROUGH!!

What next? ECM or bad injectors?

fuel pressure is 55psi+

thanks

 

I'd go with the injectors having issues, if it starts.

 

Ugh…after all this, I finally figured out the rotor was bad!

I bought an AC Delco Cap but the rotor was someone else!

a couple pals have told me the 90’s GM trucks do not like aftermarket fixes for the electrical
system!

lesson learned