I have a 92 RS 305 TBI 700-R4. There is no power after 1/2 throttle. When im in drive and want to pass someone it shifts down in second and i will be at 1/2 throttle then if i give it any more..no matter if i punch it or slowly go to the floor there is no more gains. Some times it will kick into first and then it will go but thats not what im talking about. What could it be? I have changed the fuel filter, have new cap, rotor, plugs, wires. Will it help any if i bump up the timing? Let me know!

 

Oh i for got..i also have the MSD coil and a flowmaster muff. Thanks

 

I'd check the TPS to see if it is in spec (see the tech articles). Also if the car pulls hard in First through all RPM, then the problem isn't engine related. If the lack of power is only in higher gears then I'd look to the tranny, not the engine

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1991 Chevy Camaro RS TBI w/auto
Mods:
Edelbrock TES Headers, REALLY high flow cat, 2 1/2 in catback flowmaster, 160 stat, hypertech chip, MSD ignition (rotor, cap, superconduct. wires), Bosch quad4 plugs, open air filter, all TBI mods, no smog stuff, no EGR, lots of suspention and alignment upgrades, and a big Chevy bowtie sticker on the back.

Fastest e.t.:
15.64 @ 87.8mph