My reply to Eddiebx did not post. Why?

Well here it is.
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Eddiebx,

Sure, I'll elaborate.

Let's say that I'm commuting to work and I've been driving on a State highway at an average speed of, say, 55 and I've encountered, say, 2 stoplights. When I come to a traffic backup and will have to inch forward for, say, 10 minutes, my car will not accelerate normally. It hesitates and balks. In order to accelerate, I must push the pedal to WOT or nearly WOT where it will then accelerate as though nothing was wrong at all.

This makes the problem look like it only appears in closed-loop ECU operation and not in open-loop.

Sometimes this condition will persist until the end of the commute and sometimes this condition will only appear for one or two back-ups and then end. The only consistent characteristic to date is that it never appears at the outset or in the first few minutes of driving. It seems that the motor must be at full temperature for it to manifest itself.

So, I'm inclined to believe that it's related to one of the sensors, wiring or the ECU in the engine management system.

The reason that I first tried a known-good MAP is that I once had a similar problem in my track car while at Road America. Replacement of the MAP fixed that problem and saved that weekend.

Next on my suspect list is the TPS but the dealer is telling me that I need to buy the whole throttle body for $700 because the TPS does not come separately. Looks like I'll have to get myself over to the junkyard to find one.