I need help with my 1990 k5 blazer 5.7 350 it's will start up run ruff and have to pump the gas when idling then about 4 mins later it starts to idle higher and higher then dies

Asked by Jan 30, 2016 at 07:13 AM about the 1990 Chevrolet Blazer Silverado 4WD

Question type: Maintenance & Repair

I need help with my 1990 k5 blazer 5.7 350 it's will
start up run ruff and have to pump the gas when
idling then about 4 mins later it starts to idle higher
and higher then dies so I try and start it back up
but it won't run its getting gas and spark I don't
have anything to test the pressure  on anything but
I got a new fuel filter and plugs, plug wires ,cap
,rotor  Im thinking it might be the knock sensor or
egr

1 Answer

257,875

check for vacuum leaks.

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