Question about 1991 GMC Sierra
I have swapped out everything else I can think of.
Changing parts is not a solution or fix
Testing a vehicle to find a problem is
Once a problem is found, then the solution is
usually there in front of you
Is the fuel pressure correct?
Feathering the gas,that would pertain to the TPS Sensor
Was that tested?
MAP-no control over that,do you have vacuum leaks
& were any of the maps tested & correct for your elevation
or vehicle specs
Spark Plugs Good
Rotor & Cap Clean
Got an IAC Valve at base of throttle body to clean or replace?
Posted on May 10, 2014
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Posted on Jan 02, 2017
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