severe vacum problem some how entering engine.
i have a 98 monte carlo z34.as some others commented,i can feel tremendious
suction taking off oil cap and if i pull it off real quick ,it sometimes dies.i replaced
pcv valve and sprayed all aroun intake and plentium with starting fluid and no
changes.i had a bad map before and changed it, and then had a front main seal
leaking,i replaced it.it still leaked.i changed harmonic balancer and changed seal
again,twice,and its still leaking,but not as bad,but too much.i did compression
check.2 cylinders at 155 all others 165.i did not have the vacume problem until
recently.i had checked for blow-by and rempving cap made no engine changes as
far as running.What is goin on here.the diagnostic check sad some mis-fire and
idle sensor.sometimes when i start it, it will act like it hesitates some and i also
get some weird engine sounds when cap is off.Does this O ring i have heard
about go ender the pcv valve,or is it the inch sized red one under the plastic twist
cap that holds the pcv valve and spring in place.Please help.Sincerely,Robert
Andrews