I did a 305 to 350 engine swap and i put in a crate motor that has about 50 more horsepower than the stock z28's for a 91'. I bought a prom for a stock motor and i need to know what the rev limiter for that prom is. When it my motor gets to about 4000 rpm it starts to loose power and i don't know if it is from the rev limiter or not. Feels like it is running out of fuel, and i just replaced my 2.73 gears with 3.42's and it does it even worse now. Do i need to get a prom burned to match the horse power of my motor or is there something else causing this. Just need to know if the stock prom is telling my ecm to shut off the fuel because it things it has less horses than it does...thanks for your help guys