I've been trying to tune this car with no scan tool , i was running 42psi w/vac off and it ran like it waslosing some high rpm power.Then i tryed 45psi and it ran stonge in the high rpms. Am i on the right track or is this to much fuel.I am running a Joe L 93 chip with 93 pump gas and all i can get out of it is 15 psi. Where should i go from here .