That could even be an ignition type of problem. Make sure your plug wires are tight on the spark plug ends, and the coil ends too. Could be a bad plug. Just guessing. I'd try a few simple things. Fule-injector cleaner, etc. If it didn't get better, I'd let a mechanic take a look.

Steve

STOP terrorism - Drive a HYBRID

Vehicles:
350 miles a week ------------ 2006 HCH II, Magnetic Pearl, w/NAVI (born on May 25, 2006)
350 miles a month ---------- 2003 Mazda Tribute ES-V6
350 miles a year (for now) - 1986 Mercedes 560SL