Prin

I have a newly built 346 and yesterday I started having problems. When I get over 2500 rpms, it stumbles very bad and it has no pulling power. It idles fine though.

Please help!!!!

Prin

to tha top...

99345hp

That doesn't sound like an internal engine problem to me. If something was broken inside it wouldn't idle right from my experience. I would look more toward tune, electrical problem like the maf sensor, or throttle position sensor. Those sensors will do weird things to the way your car will run if they arn't responding correctly. Just some ideas.

radkon

iTrader: (2)

Check the MAF, O2's and all electrical connections.
Make sure you don't have a vacuum leak.
Then work on the tune.

Prin

How about fuel pump? Here is a vid. When I give it throttle, it drops in pressure...

http://s76.photobucket.com/albums/j3...nt=fuel001.flv

O, and when this issue happens, the car runs really lean and the temps rise...

Sales4@Texas-Speed

iTrader: (4)

It looks like it could be a fuel pump issue. I would grab a new fuel pump and at the same time take a look at your fuel filter to make sure its not clogged up.

1sick'98WS6

iTrader: (19)

That gauge was doing some crazy **** there for awhile, Id do fuel pump as well.

TheLS1Kid

iTrader: (12)

What injectors do you have?

Prin

they are 38lbs. I did replace the fuel filter and it did not help. BUT, I drove the car today and it is perfectly fine. I will try to drive it work tomorrow. I am still getting a pump to be on the safe side. it has 17x,xxx miles on it!

Prin

It was the pump. I got a Ractronics and it is A OK now!