Hesitation when coasting ??

[wx4caster]

I bought my '04 MM in June w/ 17K miles on it...now has 20K. Since I've had it, I've noticed a slight hesitation when coasting. The RPMs aren't jumping all over the place , but there is a slight but noticable "lurch". Even passengers can feel it. Is this unusual? Is it related to back pressure? :depress:
Thanks for your input.

[W4LTD]

O2 sensor?

[CRUZTAKER]

Got Vortec?;)

Mine does it all the time...

[UncleLar]

Torque convertor locking and unlocking?

[wx4caster]

O2 sensor?
I thought about O2 sensor, but it hesitates when coasting > 50 MPH. Also no CEL. Could the sensor be bad without tripping the CEL?
Car is only lightly modded. DR tune and CAI. Car was hesitating before the mods though.
Thanks

[SpartaPerformance]

Bas o2 will always trip a CEL. I have a bad feeling it might be the transmission.

[Phrog_gunner]

I was going to say maybe the transmission hunting in between gears, but the tune should have cured that.

[ckadiddle]

Check trans fluid level/condition and U-joints?