have 1990 4.3 4x4 s10 blazer start good and run for 30 sec then run high and low once warm up run high change fuel pump 3 week ago map and tps sensor

 

[quote=al987;238158]have 1990 4.3 4x4 s10 blazer haveing problem iding. wen cold run"s high and low. change fuel pump 4 week ago,a week later went bad put new one in change map&tps&iac sersor.start ok but idies erratically wen warm up ok but not geart.

 

check air sensor? idle is a air fuel mixture.

why did the fuel pump go bad in one week? is this one on its way out the door too? not enough continuous power to run it?

 

change the fuel pressure regulator.(sping was broke)but it run"s the same.