Ok so i have changed the T.P.S, Idle Air Control Valve, and Mass Air Flow. my 4.3 isnt starting today, but when it does if im not on the gas the rpms drop to around 500 and the oil pressure drops and it dies out, if i two peddle it and keep some pressure on the gas as well as the brake i can keep the rpms up fine. PLEASE HELP ME im going nuts

 

Is the SES light on? any codes?

 

What diagnostic steps led you to replace the items that you did, or were you merely throwing parts at the problem?

Have you followed the steps in 96+ Fuel System Diagnosis?

 

did you check your air cleaner?? that will throw a map sensor code sometimes

 

guessing is expensive I bet you spent a lot of money throwing those parts in

ID follow the link rriddle3 gave you

 

I had a similar problem right before my fuel pump completely died. When it did I got no codes and ended up changing several things before finding out it was the pump.

 

this is why we diagnose the problem before throwing parts in

 

So i am replacing the fuel filter. i have went off the codes and that is what led me to replacing the sensors that i have. fuel pump is next and im wondering a good brand? autozone has an airtex complete with the strainer for 309, but rockauto,com has the same part plus many more for less. any reviews or suggestions?

 

Dont use aftermarket brands USE ac delco or delphi ONLY

aftermarkets dont last very long

and how do you KNOW that the fuel pumps bad?

did you diagnose the problem ?

 

yeah for sure dont go with the airtex, They dont last, only go with OEM, it costs more but last way longer and come with better warranties