1988 gmc s15 p/u 2.5 engine service engine soon restrained comes on idle briskly or dies used scanner give code 51?

the p/u has 80,000 miles on it have had regular grease changes . gas milage have become terible . i donthave any idea what code 51 is , the gm dealer say their books dont step back that far.

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Answers:    tune up time , hot filters

How much to respray and repair scratch...


Check your vacuum lines, could enjoy a small leak. This could explain some of these symptoms, especially rot problems. (could be many other things too). If you know where on earth the vacuum lines are, take a can of wd40 and weakly mist all around the vacuum lines next to car idle. If this process changes the decline a bit, bingo.

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