Ok so I have a 2000 f150 5.4 2wd 4 door lariat. Here's the issue I had a leak in the intake manifold located in the thermostat housing so I replaced the intake manifold. While I was at it I changed plugs (Motorcraft) cause I had it open easy access. Put it all back together and now the truck idles low and wants to stall in reverse and did and was rough to start again. I think it's vacuum leak but not sure. Please help guru f150 friends.

 

Welcome to the forum Dave !
Share a pic of the truck.

This is an introduction thread..... not much traffic

If you post your questions in the appropriate yr thread for your truck im sure you will get some answers....

But for starters grab a can of break clean and spray around the intake manifold when running.( flammable be careful) .... if its leaking it will suck the break clean in and increase the rpms of the eng.

 

Thanks for joining