[GP99GT]

could be a bad TPS, doubt the fuel pump though...and yeah your injectors could be sticking open and spraying a ****load of fuel in. try running it for a bit and pull out your plugs and see if theres raw fuel on them, smell em. the exhaust leak shouldnt cause intermittent problems. theres a way to test the TPS, you have to find out what the idle voltage should be and stuff and test it with a multimeter