Locate problem with 2007 Frontier, 114000 miles.

dkeith1937

2007 Frontier 4.0 V6 with 114000 miles. Recent tune up and replaced # 3 coil. New air filter and air intake cleaned. AT 38 to 42 mph, the truck bucks like fuel system is problem. It only bucks (stutters) at that speed range. Transmission has been checked and ok. Does not show an engine light. Can anyone respond that may know the problem? Thanks. Don

Mr_Shiftright

Who checked the transmission? It does sound like a Torque Converter issue, since neither ignition nor fuel is like to misbehave in such a narrow speed range--and that range, coincidentally, is about when torque converter lockup might occur normally. Just a guess of course. You should scan the car anyway, especially with a scanned that can read TCM transmission codes.

dkeith1937

Thanks for your help. I did have a local respected transmission shop check it. They suggested an engine miss but I do not think it is that due to the fact it only misses ( stutters) in the speed range I've stated. And, it does not always do it.... only on occasion. Do you think it would be ok to drive it using the manual system to shift into overdrive until I can get it to a qualified shop for the proper testing? I am not qualified to locate the problem and agree with you that it is probably the Torque Converter or possibly overdrive switch. Thanks. Don