engine misses at low rpms. mostly noticeable at 45-50 mph after torque converter lockup, but even does it in 3rd gear. at times it even starts a momentary nonstop miss similar to driving on a rumble strip. engine has 147,000 miles. new coil, cap, rotor, plugs, and wires. it never throws any trouble codes when it is acting up. this occurs only after engine has warmed up - cold engine runs great. a local shop drove it with a scanner hooked up to it while it was acting up and couldn't figure anything out either. . . . any ideas where to look next? not sure what it is called, but the plate that the rotor attaches to is quite corroded. i think that's all the info i can give on it. thanks for any help.