Dies at stop signs, seems low on power
I have a 1994 Bonneville that sat over the winter. When I parked it, it had plenty of power and ran perfectly fine. It seems like it'* low on power, when you stand on the gas it won't jump into passing gear. It also dies every once in a while when you get off the gas while your approaching stop signs or stop lights. It always starts right up and you can go on. I also notice while sitting in my driveway over the weekend that the idle throttled up to 3,000 rpms for a few seconds and then came back down. It seems to run fine once you get going down the highway.
Any ideas without me having to take it to a mechanic?