I read a ton of threads about acceleration stumble and hesitations, but rarely does anyone come back and say they cured theirs. Most advise is COPs and to clean throttle bodies. Would be useful to hear back from some of you to know what the problem realy was. And yes, I ask cause my 01' 4.6 does the same thing.

 

I ordered my COPs about an hour ago. I let you know how they affect that damn hesitation. For me the truck does this: I am accelerating at half throttle and the acceleration is pretty linear. Say I am getting on the highway. Right around 2400 RPM the trug seems to bog down and when the tach gets to about 2800 RPM the acceleration resumes. I think Built54 or JBrew explained to me that the Coil in the COP degrades over time and can cause that exact problem. I am meticulous with the mechanical maintenance with my truck.

 

When mine was acting like a stuttering retard, I concluded my thread with results. This was back in September? somewhere, maybe the end of August, the week leading to the Bristol TN NASCAR race if that makes a difference. I remember that because I had to drop my bro off to go to that race and fixed it that night. Usually the t-body and IAC don't, or haven't in my case made a huge difference in normal driving. It shows when it's cold and first starts up. The coil on plug issue was stumbling, then smooth (same rpm's) lets say while on the freeway. It wouldn't die, all but, and never seemed to do it while idling in park. See if you can find the thread I started around that time, seemed many trucks were doing the same thing then.

 

I think someone mentioned using a multimeter on the TPS and adjusting it to .98 volts also helps with acceleration issues. + on the middle wire and - on the bottom wire of the TPS, using wires or pins to get a lead on them. Turn key to on only measure and adjust accordingly.

 

I used to have a slight hesitation from take off, nothing as bad as you describe but it was a bit sluggish. Cleaned my IAC and maf and it completely got rid of the hesitation from a take off and smoothed things out a lot.

 

Your computer has all the power to find these replies, fixes and results.
The issue has to be set down in specific terms because there are many versions of causes of a miss, a stumble, when and where it happens.
There is no one cure fits all.
Here is some background on one cause example.
A. Light throttle missing in cruise.
1. Plugs. 2. Bad coils. 3. Use of fuel additives that leave plug deposits.
Why: at cruise the EGR is operated causing a lean mix and advaned ignition timing. If one or more bad coils have low output, missing takes place. This condition usually does not set any codes.
For those who feel TPS voltages is so critical. Any value between .9 and 1.0 is close enough. Why: because the PCM does it's own zero reference as soon as the ignition is turned on. Second why, is to automaticaly account for shifts in TPS voltage from wear and temp variations over time.
This is why the part is originally specified as non adjustable.

 

Sorry duplicate post

 

I'd say clean the maf

 

Start with the easy cheap stuff first, the whole MAF, IAC, T-Body and EGR are all easy fixes probably needing doing anyways. Getting that out of the way ought to narrow the problem down if it still exists.