I have a 1996 chevy tahoe. Recently my truck was hard to start..it eventually starts but takes a minute then fires up. When it does start, it revs up really high to about 1500 rpm's. When i put it in gear it wants to drive itself and the brakes dont feel like they wont too well. This goes on for a few minutes then stops. I noticed my fuel pressure gauge also moves up and down. Does anyone know what this may be? I am going to take it into the shop but I wanted to check with you all to see if you have had this problem or know what it may be so i can get started on it. Any help or suggestions is greatly appreciated! Thank in advance!