Simon1

About three weeks ago I started having an issue when I would go WOT my car would lose power. It only happened under WOT. If I got off the throttle, it would go back to driving normal, sometimes the issue would reappear immediately and sometimes it wouldn't. I got to thinking about it and remembered I was way overdue for a new filter. Got a new filter and put it in and the issue was almost gone. It still happened one more time after the fuel filter change and so I was still concerned. I was thinking fuel pump issue, throttle body maybe, but wasn't sure. Fuel pumps usually do not work intermittently unless it is a wiring issue and my throttle body is from KB. My car runs really clean and I only use good premium fuel. So I kept thinking and I recalled filling up at another gas station I normally never fill up at. So I went home and hooked up my handy tool I have to drain fuel and pumped the remaining gas out. Went to the station and got 6 gallons from chevron and after a few spirited test drives, all is well so far. Surprisingly so, the car feels like it picked up a bunch more power. Next fill up will include an additive to clean everything else up.

I got bad fuel one other time and the symptoms were similar. I guess the old fuel filter (dated 2007, I know shame on me) and bad gas just made the right combo to make the car run like crap.

I did pull the throttle body off and cleaned it. I was surprised how clean it was.

Next thing is spark plugs and an oil change.

johnny_raincloud

I know the feeling... Mine is starting to do the same thing. It runs like crap at WOT. I need to change my fuel filter, clean my CAI filter, clean MAF, and TB. I am also needing to give it a tune up. New wires, plugs, etc. I am hoping this will cure my woes... Just did the clutch 3 months ago. I am debating new gears as the 3.31's suck ***** on the bottom end and it feels gutless.

Nuke

Turn off TCS. It'll cut spark and/or fuel on occasion at WOT.

Simon1

Mine's been off since 2007 I think.

Simon1

I would do one thing at a time just so you have an idea as to what was the main culprit.

JFitz

There is a TSB on the fuel pumps for the 05-06 GT's. Air bubble develops under cruising at steady speed. The next time you crack the throttle it cycles that bubble and you lose fuel pressure for a half second.

Nuke

^This, if not the TCS issue.

My wife's '06 V6 had the fuel pump issue. I had the dealer replace the fuel pump after showing him the TSB (1 week left on her warranty) and that took care of it.

Simon1

I had that fixed a few months after having the car.

Still running like normal. Seems like fresh fuel and filter did the trick.