might I throw my situation in the pile
My engine wants to turn over so badly, however, after about a quarter turn is stops and about a half turn she stops, then a quarter, and she stops and every once in a while, a loud banging noise like a backfire (though that could be because I don't have the exhaust hooked up) This car is a 98 Firebird 3.8L actin more like a 98 Firechicken. I bought it with the air conditoner cut out, and a bad, starter, I replaced the starter, the fuel filter, the Crankshaft Possitioning sensor, the battery, and gave it a tune up. I've also now, poured Mystery Oil into the Plug holes. And nothing. I had to change the firing order because the guy I bought it from had them wrong, but they're right now. What should I check next. Please private message me.