4500 rpm cutout

[My90tsiawd]

This all started when i blew a timing belt on my 90 talon tsi awd. I rebuilt the cylinder head putted it back on and then started having problems. The car would run fine until i had driven it for about 20 minutes then it was terrible. At this time it was my only car so I had to run it like this for a while. Then i made a boost leak tester and have found a huge boost leak right after the compressor housing. Fixed it. Then found another one at the IC outlet. Fixed it. Now nothing seems to leak but the car won't have any power past 4500 rpm. I read a lot on it and ended up checking all the ignition system. The coil looked pretty bad and so did the wires so for a cheap fix I made a coil on plug system to make sure that it's the ignition. I know that the stock ignition is better but for a $40 fix i needed to try it. Idle got a lot better and i can now run the car for long period of time without having to unplug the maf to run right. But it still won't push past 4500 rpm. I'm starting to think about fuel issue or something like that. Could i have damaged anything by running it with the boost leak. Thanks for reading this and for trying to help me out.

It's been more than a year since I last felt it's real power. At least I got another car so I can leave the talon in the garage until it's fixed.
BTW the car is all stock but for the coil on plug system.

 

[sighless]

i fixed mine this morning.. a fuel pump re-wire kit did the trick,

 

[jesse's96gsx]

i have a gsx that idles fine revs fine drives fine......until i get my foot in it...then it hits a brick wall at 4000rpm. if i downshift and stay in it, its fine until i shift. can anybody tell me what is wrong. also my air/fuel ratio guage says im running rich while crusing. help me