2003 cavalier miss at idle rpm 500 to a 1000
2003 cavalier has a miss at idle rpm goes from 500 to 1000 i relaced plugs,wires,o2senser,iacsenser,control module,intake gasket,doesent have a pcv valve but unpluged a hole in intake cause it build pressure in valve cover and put oil in intake motor smooths out higher rpm has 60 lbs fuel pressure but only has 10 lbs vacum new air filter why is this car still missing has a p0300 code
It sounds like you have a vaccum leak somewhere.
checked compression its 175 but cant find vacum leak ecoteck motor only has 2 vac linees brake booster and tranns spayed either on engine cant find it
every now and then those motors have intake leaks it would explain the low vacuum and random misfire
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