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I'll try to help you out if I can, you changed the fuel filter, and air filter, have you checked the engine idle speed?
The timing could be off as well. The EGR valve could be bad as well. I've heard that if there's a vacuum leak or if the valve is bad, it will cause erratic idle. But eliminate timing, and idle adjustment first. Worst case, it could be the TPS (throttle posisition sensor). That cost me $300 at the repair shop a few years ago to have replaced. For what it's worth, I hope this helps out...
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