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Originally Posted by j cAT
with the fuel test the ICM being the problem would be a good guess .. also at this miles and the ICM original I would replace it.
just make sure you use the HEAT SINK THERMAL COMPOUND !!.
This helps reduce ICM failures this is same product used on , power transistors and computer microprocessors.
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Echo j_cat's comments, I've had a similar issue solved by replacement of ICM. You indicate problem occurs when starting warm engine and you say you think ECT is good...on what basis? Did you test it? Easy test to do, all you need is an ohmmeter/multimeter and a pot of hot water.
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Originally Posted by dmc1953
The check engine light has not come on but many of the lights in the cluster are burned out and I haven't felt like going to the trouble to fix that so it is possible that the check engine bulb is bad.
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With the truck off, when you turn your key to the on position (prior to cranking the engine), the oil, brake, and service engine soon lights (among others) should illuminate. This is how you know which bulbs have gone bad. If you've never replaced dash lights on these models before, it's really not too bad. Should take about half hour.