rpm fluctuations while driving
I have a 2002 Ranger Edge 3.0L v6, with an automatic trans., and it has developed a problem of the rpm fluctuating between 2500 rpm, then will jump up to 3000 rpm, then drop back to 2500, then back & so forth. This happens while driving with & without the cruise control on, mostly highway miles, 30 miles 1 way to work. I have had the transmission fluid changed and a new filter put in, and the mechanic said that everything looked good. This problem seemed to arise after I had to replace the camshaft sensor up by the firewall. Any ideas would be greatly appreciated, this seems to be impacting my fuel consumption as well.