1993 Pontiac Transport Van Severe Idling Way Through Rpm Range Replace

1993 PONTIAC TRANSPORT
133,000 MILES
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Van has a severe idling problem all the way through the rpm range. Replace the air idle intake solenoid. Van ran great for about 45 miles. Then the next morning the symptoms came back. Then it got worse and remained bad.it will run ( doesn't die) just not smooth. The idle jumps up/down about 500 rpm fluctuation, again all through the Rpm range. I fugued perhaps a vacuum leak , but why did the solenoid temporarily help? Any suggestions ?
Dec 7, 2012 at 6:47 AM
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RASMATAZ
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Do you have a check engine light and when was your last tune-up? Also give me your engine liter-
Dec 7, 2012 at 7:08 AM
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