Check Engine Light

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Hello, I have a 1995 Chrysler Concorde with a 3.3 & 118k. I bought it from the original owner about 10k ago. The check engine light goes on and off. The problem is..it goes periods when it almost want's to cut out. Sometimes when I start it...it idles very rough and when you hit the gas it doesn't go no where but sputter. Then on the highway the other day...the check engine light came on and when I went up hills and had to accelerate the car didn't like it and would sputter until I let off the gas some then it picked up. For the first time since it's been going on the last 4-5 months the car cut off soon after a rough idle start and wouldn't re-start for about an hour...then ran fine for the next 300 + miles. Any idea's?..would be most appreciated. Thanks, Steve.