have you checked the rubber "T" coupling on the passenger side at the
back of the engine to see if it has a hole in it?
follow the PVC line from the passenger side to the back of the engine.
do this while the engine is cold - it's easier. might have to take a
flashlight to see it well. the original "T" collapses in the middle and
the replacement has a more ball shape for strength.
it will suck air into the intake and throw the fuel mixture off.
if you do find the "T" bad, then follow that line from the "T" to the
driver's side bank at the back of the engine. it has a straight line
rubber hose that collapses too and will suck air too.
hard to find, but you won't forget it. i sure didn't.
hope this helps.
knowledge is power - growing old is mandatory - growing wise is optional
"Many more men die with prostate cancer than of it. Growing old is
invariably fatal. Prostate cancer is only sometimes so."