rpm loss/hesitation over 7000
 

I've been reading rpm loss hesitation threads for a couple hours and can't find one that sounds exactly the same as mine. I left work after warming up the car for a while got on the road and shifted into 2nd once it hit about 8500 rpm it cut all my power and jerked me forward in my seat. Once I got onto the country roads again I went wot on my way to 3rd gear and it cut again. I pushed in the clutch and just revved once it hit 7500 it cut the power and dropped all the way once I let the clutch back out it bump started. I did a few more pulls wot with the cut out getting worse until it was about 6000 rpm when it would lose all power. I got home waited for the car to cool down and removed my cat to put on my catless midpipe. Took the car down the road got it warmed up again turned around and wot was a lot better but now it hesitates over 8000 up to 10000 almost like sputtering rpms. The car is an 06 gt 6 speed with 33000 kms I put on bhr coils with new plugs and wires about 8000 kms ago. I have a Cobb tuner with just a stock tune with adjusted dwell settings and the o2 sensor cel disabled. During my drives the cel never came on and I have no stored codes. The stock cat still has the honeycomb intact after I removed it. The closest thing I read it could be in a bad fuel pump does that sound right.

It could be a bad fuel pump yes. Have you ever cleaned your SSV?

Edit: Double check all of the wires and coils. Make sure everything is still plugged in properly. Believe it or not check your plugs and make sure they are tight as well. Clean the MAF and make sure the throttle body is clean. All of this is just to be sure.

I had similar issues after the car was warmed up. At wide open throttle it felt like hitting the rev limiter at 7000rpm but at half throttle I could still redline it. Replaced my fuel pump and it solved the problem.

I've never cleaned the ssv or throttle body. I cleaned the maf when I did the bhr swap and put on the air duct.

Boeuf did you put in a stock fuel pump.

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No, I've been running a walbro for the past 40000km.

This morning on the way to work car had no issue hitting red line. There was no hesitation or stutter so could it just have been the cat clogging. I'm going to clean out the ssv, maf and intake just to be sure. If it is the fuel pump will it only act up when the car is really hot.

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