I had the same problem with mine...turned out to be plugs and the catalytic converter.

I use Jose Duran. He is at 35/Walnut Hill area. 214.351.4254.

He has been great with my car and MUCH less expensive than any place I've found.

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R Talley
88 BMW E32 735i (make it go away)
95 Volvo 960 "Inga" (valve problems)
95 Nissan Maxima (the indestructible)
89 Ford Ranger XLT (ugliest truck in the South)