I bought an '88 Camaro with a 305 TBI. The guy said it's been sitting for 2 years. He said the car needed a new fuel pump and it should run. I've replaced the fuel pump and gotten the fuel system to work. With a new battery I was able to get the engine to turn over but it never fires. I've replaced the spark plugs/wires and the distributor cap/rotor look brand new. I've installed a new HEI module and still nothing. What else could be the problem?