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Looking for help, i have a 1995 formula 583 z, the bottom and top end are new rebuilt, which is a dog to pull and start, it takes to people to start it, i have put on 250 km since done and i am having problems, I went for a ride and it was running good after about a 100 km it back fired a couple time and wouldn't start again. The plugs were bent on the top, i put new plugs in it and it wouldn't start, i waited for an hour tried and it started so i just parked it. The next day i went out to start it and it wouldn't start, again i waited a couple hours tried it and it went, i brought to my mechanic and after 25 km it back fired and bent the plugs again. My mechanic is baffled and doesn't know why this is happening. After a couple of weeks i thought i would take it for a ride and again this happened. any ideas of what is causing this to happen. the bottom of the spark plugs gap and colour is good. Thanks