Truck: 2003 Tacoma SR5 2.7 4x4 with 85k miles
Issue: After cruising on the highway for 20 minutes or so, longer also when I come to a stop my idle fluctuates from 1200-2000 up and down then stays around 1250. If I cycle the key it will continue to do this also. Then around town I have had it dip down too 548 and almost stall before i recover the idle with a rev I get some fuel knock while doing this. What would cause this...I'm new to Toyota.
Thanks for help Dave