I drive a 1993 Pontiac firebird formula thats bone stock. When its cold it runs fine and drives great but when it warms up it starts to bog down from 1400-2000 rpm and can barely move. It also has a hard time starting when hot and has died when trying to start it. What could it be? last month I replaced the water pump, Optispark, Spark plugs and wires. Starting to regret not getting an ls1.