I have a 1999 Chevy Suburban with the 5.7 liter motor. When I let off the gas, the truck doesn't slow down right away, it kind of coasts as if you shifted it into neutral, and then somewhere between 3 and 10 seconds you feel the back pressure and it starts to slow. I can have the gear shift in any position, D, 3, 2, 1 and it acts this way.
If I disconnect the Throttle Position Sensor (TPS), the issue goes away. When you let off the gas, the truck starts to slow right away, like a normal vehicle. However, running with the TPS disconnected causes bad things and so it's not a long term fix. I've replaced the TPS with a known good one and it drives the same.
A neighbor has an identical truck and it does the same thing. His has over 200k miles and it's "..done it forever, I think since new." Mine has low miles but I haven't had it since new but it's done since I've had it.
What's causing this and what's the fix? Dealerships tell me it's the way it's designed, nothing can be done. Some people say I need a new "chip" that will give more power and will fix it but they can't tell me why so I'm not so sure they know.
I've searched various Chevy forums and I can't find the answer. I'm hoping someone here has direct knowledge or experience and can just give me the answer.
Thanks
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