Got a 91 blazer (205,000 miles) that sometimes will die out at idle. Let it sit and then starts right up and runs fine (intermittent). I replaced the tank, fuel tree on top of the tank, fuel filter and fuel pump about a year ago. Codes were reading bad oxygen sensor and map sensor. Replaced both and currently no codes show up on the code scanner. Any help would be appreciated.

 

I also replaced wires, spark plugs, rotor and distr. cap recently.
Thanks

 

What brand of plugs, wires, cap & rotor did you use?

 

Bought from autozone...do not recall brand and not able to check for a couple days.

 

These trucks are really picky...replace 'em with AC Delco. For the wires, Autolite Professional seem to be good, but get Delco for everything else.

 

I hear ya but when it runs...it's not missing or sputtering...just intermittantly dies, especially at idle. No expert here but seems like it would run crappy all the time if the plugs, wires were the problem.

 

Idle Air Control Valve.

 

Replaced Idle Air Control Valve, Ignition Coil, fuel pressure regular, fuel pump, and fuel injector relay. Still same problem. Local mechanic figured it out and it was the electronic spark control module.