Hey all, I just purchased a 1994 Silverado 5.7L Extended Cab. I purchased this truck for mainly hauling purposes. It has 233,000 miles on it and runs better than most trucks with this type of mileage. With that being said, I have a problem. Recently I have noticed the "Service Engine Soon" light appearing approx. 10-15 minutes after it's been running. A couple days ago I was travelling on the interstate doing about 70mph when I approached an incline. In order to maintain my speed I accelerated however, the RPMs did not increase and the speed never increased. After flatting out on the road I attempted to accelerate again however I couldn't get about 45-50 mph. I pulled over and turned the truck off for about 5 minutes. When I started it up again the "Service Engine Soon" light disappeared and I got up to 70 mph again just fine. When I approached the next incline I had the same problem as the first incline. Wouldn't accelerate. When I first bought it I noticed the tranny was a big sluggish when shifting from Park to Reverse. I'd have to wait a second or two for Reverse to engage. Also when I got from 1st to 2nd it jerks just a touch. All the other gears work just fine. Is this a major problem? Or simply a transmission fluid change? I don't want to have to replace the whole transmission nor do I want to shell out hundreds of dollars to get it fixed. I traded to junkers and paid $1400 for this truck so I don't want to put a bunch of money into it but I love this truck and I just got it! Any suggestions?