Help With 99 Gtp

Hello.

I have a problem with my GTP.

For the past week, it has been misfiring sporadically. One minute its running normally, the next its stalling on me and misfiring.

I have changed the plugs, ignition module, checked the coils, injectors, EGR, Map Sensor, Idle Control Module and everything is working good. the car produces no engine codes.

Has anyone else experienced this, or can anyone help me solve this problem. The car was at my mechanics for 4 days, and he cant locate anything wrong.

THanks

George

Has the Fuel filter been changed??

no, because it is misfiring in 4 out of the 6 cylinders

what plugs are you running?

did they check the crank shaft possisitiomg sensor either the wires are shot if theres no codes could be emmision related go to our site www.conncgp.net and post it under tech. these guys are good and can help ya

Thanks for your help. The car seems to be doing it all the time in reverse now...and just once in awhile in drive. I dont get it....

So its misfiring while in reverse?

yeah, all the time..and sometimes in drive

have had problems with plug before. I install new champion plat plugs and experiance missing problem. I went back the boush 4 prong plugs to solve this problem.

I have 1999 GTP with 130000.


My current problem is 171 lean fuel SES code.

I've replaced the fuel pump, the vaccum harness. I have a fuel pressure regulator on order. But I am wonder if I should install an adjustable reg, performance part instead of the OEM.

My fuel pressue is about 40 psi, should be about 55.

Do I need to install a small pulley if I get an adjustable regulator?