HELP - 1998 740 won't accelerate
I recently purchased a 1998 740iL (190k miles). When I start the car in the morning, or after a few hours of sitting, the car will not accelerate. For the first 5-10min, it goes no more than 5mph, pedal to the floor. In Neutral, the engine revs just fine. Temperature gauge is cold. After a while, it will slowly warm up and accelerate fine (temp gauge reaches normal). The only dash lights that show up is "CHECK COOLANT LEVEL".
Please keep in mind, that the reason I'm posting here is to avoid taking the car to the dealership. I've been to a few small mechanics who aren't sure what the problem is.
All help is appreciated, but what I'm really looking for is someone who's had a similar problem or is pretty certain they know what the problem is... (previous posts have been answered, but not resolved, with no further comments).
NOTE: I have changed the transmission fluid and filter, but it has not resolved the problem.
Thanks in advance!