My 5.0's acting strange. It started a year a go and has gotten dramatically worse over time. When I first start up the car, it can take nearly a minute for the rpms to settle just under a 1000. Before it settles the needle goes up and down and if I don't give the car a little gas it stalls. This also happens when I down shift to second whilst making turns. The rpms drop below 500 and the car stalls, which is not fun when people are turning behind me. Any thoughts. I thought it might be the tps but I don't really know. Other than this issue the car runs great the rest of the time.

 

run a koer test and check for codes, if none check for vaccum leaks, if none , could be a bad or dirty IAC motor

 

you need to do a base idle relearn, and clean your IAC.

worked wonders for my car

 

Do what the old boys said.Vacumme leaks,check codes,base idle reset,fresh tune up.Problems after that,then post up and help will come.GL.

 

Thanks. Will try these things.