So I was driving my truck home maybe 3/4 mile from my house, slow down to take a turn and the rpms drop all the way down, truck dies


Start it and it cranks for a second and fires up pretty weak but runs maybe a second and dies again

Shut it off let it sit for a minute then restarted it again and gave it a little throttle that kept it running. Took off trying to make it to the house, dropped it into first to keep the rpms up while I turned

Got on a back street closer to my house and put it in neutral and let off the throttle to see if it would die again

It did

Restarted it with some gas drove it home got in the driveway and its idling fine

Tried to kill it by blipping the throttle and it would idle down under 500 but come back up

Couldn't kill it again


So I just turned it off and left it



IAC? Fuel pump?

Checked it for codes as soon as I pulled into the driveway, didn't have any

Truck is a 98 5.2 with 195,000 miles and a bad plenum

 

probably check fuel pressure but id check if your iac is gunked first.

 

Yeah, the bad plenum tells me you need to take a close look at your throttle body, and see just how dirty the IAC well is.

 

Clogged cat, bad o2 sensor, fouled plugs.....plenty of places to start with a bad plenum.