Engine limited to 5000 rpm 1990 ZR1 LT5

[DPZR1]

Replaced parts:Fuel pump -From Jerry's
Fuel injectors - From FIC
Secondary fuel pump relay - From Chevrolet
1 butterfly port actuary valve - from Chevrolet
Both O2 sensors - from Chevrolet


Here's the problem:


Car pulls all the way to 7000 rpm in 1st and 2nd gear. In 3rd gear it pulls great to right around 5000 rpm and hits what feels like a rev limiter. The fuel pressure is at 42 gph at idle and climbs to 50 gph under acceleration, never drops. Upon hitting the rev limit, the vacuum gauge which runs at 20 hg drops instantly to zero and a code #54 (fuel pump voltage low) and code #61 (secondary port throttle system error) show up in the computer. When the problem happens the check engine light comes on and turns off upon idling. At this point the 5000 rev limit happens in every gear. If I let the car idle or turn it off for a minute, the problem resets it's self. Any ideas!!! Help!!!