A symptom that I see sometimes, is a misadjusted TPS, which turns out to be a faulty TPS, and it's creating issues for the engine management system.
What this means is, you can have a worn-out lug (the mechanical part that moves with the throttle plate), or they can be worm out electrically, inside the throttle position switch.
Now, what that can create is, if you are holding the throttle position switch at a given point, and inside electrically, it's not actually connected, it's worn out, bent, or just damaged in some way, the engine management system is going "I am at 5% load; no I'm not; yes I am; no I'm not....".
What this can create, is an acceleration enrichment. So, you're driving down the street, holding the throttle still, and all of a sudden, you are getting enrichment, then you're not getting enrichment, then you are getting enrichment, etc. It can create a very poor mixture, very poor fuel economy, and sometimes very poor drivability.
What is can also do, because we have a nice sweeping arc of the throttle position switch, and for if some reason electrically, there are damaged points, as you accelerate, and your acceleration enrichment happens, you've got a break in that acceleration enrichment. So, all of a sudden it's getting enrichment, it isn't, it is again, so once again, you create a flat spot.
That's working on the acceleration enrichment side of things.
The throttle position also tells the engine management system where to start to work with the idle speed. And as we have mentioned in other articles, idle speed devices are very important to achieving a great driving experience.
So, if for some reason, your throttle position sensor is not working, your idle speed motor doesn't know where to be.
Now you've got two scenarios.
The first is a car that stalls at lghts, and a car that flat spots as it takes off from the lights.
And that could be due to just a faulty throttle position switch.
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