My car idles a little rough and has no power to Move

ASKING NICELY ;)

MEMBER
2002 CADILLAC ESCALADE
6.0L
V8
4WD
AUTOMATIC
254,019 MILES

It will go under slight pressure to the pedal, but chokes out if you apply pressure, yet no indication lights show on the dash.I think I'm going to try replacing the fuel pump, pressure sensor and map sensor, as well as plugs and wires. If this doesn't fix my issue what should I check next?

1 Reply

STEVE W.

MECHANIC
13,011 POSTS

Welcome to 2CarPros. First I wouldn't replace anything before you test the pump for actual fuel pressure and flow. That is easier to do than just replacing expensive parts that might be in good shape. You can usually get the tester at a parts store as a loaner tool.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

As for the plugs and wires, if they haven't been changed in a while then they are a good item to do as maintenance as would be the cap and rotor. I would also suggest cleaning the throttle body and the mass air flow sensor and changing the air filter as well.

I worked on a GM a while back that was acting similar to yours, it had low power and acted strange. Tested the fuel pump, regulator and more and couldn't find anything really wrong. Then I started at the air filter and worked my way back checking on the intake side first. The culprit turned out to be a small bug that had gotten into the intake and died on the hot wire element in the MAF sensor. It was causing the wire to take more power to keep it heated and the ECM decided that it needed more fuel because of that.