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Normally an engine misfire, rough idle and hesitation or stalling/surging will occur when the spider injector system is on its way out. You should scan for codes, look for codes such as po300, po300b po301-po308. specific codes like po304 will indicate a misfire in cylinder four. po300 is a random multiple misfire, which could be caused by clogged, or partially restricted catalytic converter, damaged or burnt valves, excessive carbon build up resulting in pre and post comustion.injector issues may not be mechanical ie. carbon is your enemy... check your fuel pressure, remove spider connector and check resistance of each injector (11-14 ohms) any more or less replace the injector that is out of specs. if they check out good, you still may have an issue with one or more, upper intake removal would be the next thing to do in order th physically inspect and clean injector ends.this is assuming you've checked for tune up related issues, and vacuum leaks and found no issues..you can also find a shop that uses the otc genesys . it has a program that allows you to check each individual sensor/component. ( in repair track/ sensor info.) I hope this helps you, and good luck. jm

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