On the way home as I was driving up the on ramp, just about to hit 60MPH in 2nd my car miss fired really bad, kind of like if I would of hit the rev. limiter. Shifted and drove on fine. Car drove for some 15 minutes OK at normal cruising speed. As I was driving down my street just before my house I tried to give the car some gas in 3rd going about 35 and car miss fired a tad. I let up and the car was fine again.
Other then really bad miss fire and short one the car seems to be running fine.
The car did not stall or rough idle before or afterwards.
What could be the problem?
Bad gas, ignition coil and or modulator going bad once again?

Any ideas?
Thanks.