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Re: 88-98 FAQ's "Is your truck running weird? Check here it could help"
This post should be moved to the S-10 forum.
A moderator will most likely move it.
This area is for instructions on FAQ (Frequently asked Questions) ONLY.
First thing you should do is check for trouble codes. This can be done without a scan tool.
Instructions found here:
http://67-72chevytrucks.com/vboard/s...5&postcount=11
A bad coolant sensor that the ECM monitors could be causing mixture and idle speed issues.
It can be tested with an ohm meter.
Instruction found at post #7 here:
http://67-72chevytrucks.com/vboard/s...d.php?t=322811
The ECM will not send commands to the IAC is the TPS (Throttle position sensor) voltage does not read in the idle range. This can be read with a scan tool or a multimeter. The specification is .5 to 1.25 volts with throttle closed.
If the plug wires are coming loose they should be replaced.
CT
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For those of you that are wondering why you are not getting replies to your thread:
Did you give the model, year, engine, fuel system type, and transmission information?
If it is modified from what came stock from the factory, let us know that too.
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