I have a 1994 grand Cherokee Laredo 6 cylinder 4.0 liter. I can start it up and drive it but when I turn it off and try to restart it, the jeep will shake real bad (possibly misfiring) I will push on the accelerater the car will slowly move and starts to make a piping noise then the rpm will jump up and it will quit popping and works normally It does this every time I drive. Any suggestions -Thanks Ryan

 

Might be a simple thing to ask but, do you have a check engine light on? Did you check for any codes?

 

It didn't have any codes and the check engine light is not on

 

could be a injector leaking a little, vehical has to run for a few min to clean up the unburnt fuel

 

if he has an injector problem.. maybe he too should try some seafoam in the fuel tank?

 

It ended up being the fuel pump

Thanks for the suggestions and help.

 

heh.. well we were close in assuming a fuel delivery issue