i have a 2007 access cab, 6cyl, at. when at approx 30 mph the rpm's will drop from 3000 to 100 then immediately back up to 3000.
toyota charged me $350 for a complete tune-up and this did not help. they checked the pressure of the fuel pump and it was good and the fuel filter was clean. i'm not sure what to do? i find this to be a security issue. can anyone suggest what to look for or do?
thank you in advance