Kasey I have some more for you to check out:
Head gaskets are common issues on these engines. Look at the coolant reservoir, see if its chocolatey...if not that, start it, and look for bubbles in it.
Listen to the fuel pump...if its whining really loud...the bearings are pretty much shot and it will need a new one.
Also check out the CIS (fuel injection) system. They were a pain in the ass to work on, so there might be someone who tried to hack something. Check the idle, if its too high or all over the place...if the system has been altered don't buy the car, its not worth the headache.
If oil wasn't changed religiously, might want to think about some valve seals.
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87 iroc with the usual go fast stuff
heavier than your half ton.
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