can anyone help tuning/detenation issues.

[thecavi]

I have a 89 z24 with a 98 3400.Ive done everything possible to make the car run correctly but havent suceeded.The car runs fine til about 15 mins after driving it starts breaking up under wot.It does something to the coil packs and they no longer work.u can put another coilpack on and it runs fine then does the same thing.Does the 3 wire coolant temp sensor cause any of this bc im not running it?