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Most parts stores will have a fuel pressure tester available. This is the best place to start, as presence of fuel at schrader valve does not tell you if pressure is correct. Hate to say it, but without proper test equipment you will have bad luck trying to troubleshoot newer cars. For spark, use a timing light, or a cheap inductive spark checker pen. I got my last one for less than $5.
It may be time for a pro to look at it. You dont want to guess wrong on a PCM. Are you sure you have Injector pulse? One side of the fuel injectors should have power and the pcm grounds them to make them open. If the engine runs on carb cleaner its not getting fuel.
distributer cap may be corroded inside or ignition module coulda failed--computer mite be worn after 23yrs-pull plug and cleanit--the same with fuel pump--try to get a mobile scan guy----------parts places have troublshootn books as well as library ---dont replace parts till u kno the solution-or u can git frustated and broke
I dont know about fuel but if it is actually oil, heres what that can mean. Oil is leaking past the worn valve guides or piston rings into the combustion chamber. Causes hard starting, misfiring, and hesitation. I recommend checking and fixing any problems with the guides or rings and changin the spark plugs once you find the problem. Please let me know if this helps and please rate my response for me. Thank you
3.8 are known for ignition trouble but first use the fuel release valve located on top of engine under a screw cap to see if your getting fuel. It takes 4 things to make engine run fuel spark air and compression. But most likely the Ign control module or crank sensor. So try this 1) check the fuel pressure 2) check for spark 3) compression test