1999 Grand Prix - Surging under Acceleration

hey all...question/problem

1999 Grand Prix, 3.8, 110,000 km/65,000 miles under light to medium acceleration, usually while 3rd or 4th gear at any speed, car surges/hestitates - tachometer shows revs "bouncing" - its wicked to watch the tach - flapping around like that, but can't be good - if i give it a bit more gas, it drops down a gear and accelerates smoothly again - so it kinda seems to be when the engine is under load which makes me think its engine and not trans - recently changed trans fluid (every 50,000 km) and other than fluids, filters & brakes - never any probs - thinking: maybe egr? wires? by the way - i'm up here in ontario canada - started noticing this this summer - and hasn't gotten better (even after trans fluid change) - and its not weather condition related...any ideas? tia
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wkolasa
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