Engine struggle at 5k & up???, Spark plugs? Options

[str8thugginit4ya]

What's up guys?

I asked Culp about this already and he advised me that it is probably the spark plugs, wires, etc. But I thought I'd ask around, even though he is a veteran at Celica problems. I have a 94 GT with a swapped 3rd gen 3SGTE, FMIC, Greddy Boost Controller, HKS BOV, and 3 inch piping with a Apexi exhaust. Not sure if all this is relevant, just thought I'd let you guys know my setup in case any of these things has to do with the problem. I usually don't drive my car hard, but the other day I tried to red line it and when I reached about 5k, the engine started to struggle to get higher. When I punched it, it pulled HARD. But when I reached 5k it wasn't pulling so hard again. Any suggestions on what may be causing this? I didn't check to see if the boost was still hitting hard, but I doubt this is a turbo problem. Thanks in advanced for any help!



-Ryan