99 Blazer Torque Converter

We're working on a 99 Blazer and the torque converter has an issue locking up.
At speeds between 40mph - 50mph and under medium load (i.e. going up medium incline) it seems to lock/unlock, lock/unlock.
WE replaced the tranny filter, added new fluid and the TCC solenoid.
What's next?
At speeds between 40mph - 50mph and under medium load (i.e. going up medium incline) it seems to lock/unlock, lock/unlock.
WE replaced the tranny filter, added new fluid and the TCC solenoid.
What's next?
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Comments
So the TPS might be bad which is not giving the right read on whether the torque converter should be locked or not?
We drove it with a computer hooked up and the computer is saying it's locked, but it's bouncing from locked to unlocked.
Still think it's TPS?
Why would there be no code?
Thanks for the help.
Kevin
Are there any possible items that the mechanic may have fogotten to replace? He says that he's replaced all the components in the transmission as well as the value body. I'm beginning to think he's short cutting something because it doesn't really drive much different than it did when second gear fried. I've only been able to make it a couple of weeks each time he works on it.
I'm sort of stuck now, as much as I have invested. I thought that if I possibly asked some direct questions I might be able get the thing fixed.
Any advice is appricated.
Thank you.