Searching4Sierra

iTrader: (27)

In any gear the car pulls nice until 2500rpm and then falls on its face and builds rpms very slow.

There is no ses light...yet, and everything else seems fine

I have no idea where to start, maybe clogged cats? any input is appreciated.

p.s. If you followed my last thread i just put in a new alternator to fix my voltage issue.

conan

iTrader: (5)

Could be a cloged cat, have you ever noticed it glowing red hot? Change the fuel filter and check your fuel pressure. When's the last time the plugs were changed ?

Searching4Sierra

iTrader: (27)

car has 70k on the clock

Changed the fuel filter at about 65k

im not sure when the last time the plugs were changed or if the ever were.

How would i check the fuel pressure?

Searching4Sierra

iTrader: (27)

would a bad ground cause any of this??

Searching4Sierra

iTrader: (27)

Ok i started with one of the cheapest possibilities and in worked

I cleaned my MAF, and wow what a difference. I never knew the car could pull that hard. The MAF wires on the inlet side were completely black.

ramair21

iTrader: (2)

great Job!

conan

iTrader: (5)

Glad you found your problem. For any future problems you can get a fuel pressure kit with all the gauges, hoses, and fittings for most make and model cars. You pulmb the gauge up to the fitting on the end of your fuel rail and fire up the car. You should see 58 psi of fuel pressure.