1999 GMC Other

Engine problem
1999 Other GMC Models V8 Four Wheel Drive Automatic 161245 miles

I have a 1999 gmc suburban. Im having starting issues. It turns over, and feels like a motor with timing issues. Like the timing is to far advanced or retarded. Sometimes it will start, but it runs rough for a while then cleans up. After that it will start a few times then go back to the same problem. I can hear the fuel pump running, so I dont think that is the issue. But it turns over like a hot engine with timing issues. Any ideas?
January 20, 2008.

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