hesitation after major tune up
 

hi, im experiencing hesitation at light throttle between 50-55mph and sometimes at 45 and ive done the following:

replaced spark plugs and coils with motorcraft

replaced fuel filter

cleaned MAF sensor

took it to a trans expert and he said its not the transmission also got a trans filter and fluid replacement

got a catalytic converter restriction test and it was good

i have a P0420 catalytic efficiency code below threshold bank 2 but its been there way before i started having this problem


any advise? thx in advanced!

Did you ever figure this out?
 

I know this post is really old, but i just bought a MGM and am having a similar issue..
I get what feels like a miss around 50+mph and it seems to get worse the warmer it gets.

So far..
New Belt, Idler Pulley, tensioner, plugs, coils, water pump, coolant flush, oil change, power steering pump, bearing for the AC, new brakes all the way around, new hardware for the ebrake, new fuel filter, cleaned all the fuel injectors..
I compression tested each cylinder too.. honestly can't figure it out.. It just doesn't appear to be consistent.. was thinking a clogged cat, but i would think that the speed wouldn't make any difference if that was the case..


thanks in advance..