i have a 2002 ram van,5.2 318 engine, the van will idle for about about 5 minutes, and then it starts to make a very loud suction noise from the throttle body and idle very ruff, i have replaced the TPS, full tune up, etc, and still does this, took it up to have the codes read and nothing, i am stumped, any ideas???

i think i found the problem, bad intake gasket

althought the intake/plenum gasket was bad and i have replaced it, its still doing the samething, and runs even worse now, no power on the take off, pop'n out the throttle body, unbelieveable how you can put 500 bucks into something and have it run worse, this is my first dodge vehical, and will be my last.

See if your MAP and TPS connectors are revered or if you left a vacuum hose off.

nope, they are not, no vacuum hoses off either, its gotten proggesively worse in the last week, i could barely drive it 3 blocks today, even though its got brand new tune up, TPS, intake gaskets, thermostat, water pump, the plenum gasket was leaking bad , thats all cleaned up, i'm starting to think its the fuel pump, the van has 93,000 on it, and its about time for that, i had a 94 duster started doing the samething at 92000, replaced the pump and it was good to go, i'm going to take a pressure reading first thing in the morning and that should tell me.

Clean or replace the IAC.

https://dodgeforum.com/forum/dodge-r...n-the-iac.html

Doing so only affects idle quality, the IAC doesn't explain the bad driving issue.

i took the van up and had it diagnosed, supposively its the oxygen sensor, we will see.

so replaced both O2 sensors and it runs greeaaaat!!! i should have known that from the plenum gasket leak they should have been replaced at the same time i did the gasket,