i changed my optispark from the old style spline drive to the new style pin drive in my 94 obd1. is there anything i need to change in my tune to make the opti compatible? i read in gm high tech performance they had an issue with their 94 project car after they made the swap but they never said exactly what the problem was. i have been fighting a high rpm miss for a while now. car is missing @ 5000 on up, almost like a rev limiter. plugs,wires, O2,coil is new.