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Very possible bad head gasket and fowled out plugs and/or O2 sensors. Remove spark plugs and check condition of them and pull O2 sensor to see if it is green from antifreeze. Good luck.
Use a gage and check proper fuel pressure. With tbi fuel injection, the fuel pressure is 9--13 psi. I have seen fuel injector spray pattern that looked good to me, but, the fuel pressure was half of what it should have been. 5 psi may show a good spray pattern, but, it won't start and run a v8. In my opinion.
Any applicable trouble codes? Your obd1, you should be able to check some codes yourself, if there are any.
check your tps it may have gone bad. had that happen to a friend changed out the tps and when he cranked it it stayed on hope this help u out let me know
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