I have a 94 G20 148,000mi. runs great at hiway speed very slow at take off has new air filter what else could I check????

Get a tune up. Check the engine section at www.g20.net for more options to speed up your car.

when i put on Iridium spark plugs on my '95 G20, the car flew like it got wings on it.

im going for the serious upgrade now tho.