I purchased a 2002 Sprinter with 84,000 miles on it...within the first 4K miles, I had to replace a) sensor in transmission ($1,100) and then b) new transmission ($5,200 - the first $1,100 didn't take care of the problem). Now, about 50,000 miles later, I am having an issue with pickup, highway speeds and power. It will take me 3 - 4 miles from an on ramp to get up to interstate speed and if I have to climb any type of hill, I drop from 75 mph down to 60 mph... I'm kind of afraid to take it in because these are so d>>>> expensive to fix! Any suggestions? I should have at least 5000 more miles on fuel filter...to me it seems like it doesn't kick into overdrive or give me any power... Thanks in advance for any comments...

JIM T.