SOURCE: vacuum hose
It's alot to handle at once but, I hope this helps you out...
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http://www.courtesyparts.com/betasite/maxima-a32b-1995-1999/genuine-nissan-parts/engine-electrical/223-vacuum-piping/-c-1783_1784_1814_1817.html
SOURCE: Where is the vacuum hose
IF the engine was revving high RPMS it had to be a serious vaccum leak. If the PCV came undone it would cause it rev up quite high. the shaking was from the factory set RPM limiter when not in gear (around 4,000 RPMS) the only other vaccum leak big enough would be for the brake booster. They both have a check valve but that doesn't mean much. I would start there PCV is around 5 bucks and the other is about the same. If you need pics of location I could do that also.
SOURCE: In need of Vacuum hose diagram 1988 chevy 1500
run to autozone and buy a hayes muanual for your truck. i got one for every vehicle i own, they're great! (please rate my answer)
SOURCE: i need a 1987 chevy S10 vacuum hose routing diagram
Go to Autozone.com, become member, will give you repair manual,location of parts,diagrams.
SOURCE: vacuum leak
mine is doing the same, it's your pcv receptor on the manifold. that hard plastic cover is actually part of the intake itself, if it "came off" it would cut your intake in half. that seem seals the two halfs together. you gotta pull the whole intake off and replace it... or jimmy rig it.
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