2017 Hesitation issue at idle, replaced fuel pump and throttle body but still happening .

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Fasttimes

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My 2017 Limited for some time had been randomly dropping RPMs at idle. It'd be like when sitting at a light or coasting to a stop. The motor would drop to around 400rpm, then catch itself back up. This went on for some time till finally it didn't catch itself and the motor cut off mid-driving. Fun times.

Took to my local shop, scanned errors indicated bad fuel pump. They dropped the tank and replaced and put back together and the issue happened when they test drove. New error indicated throttle body bad. That was replaced as well and truck was picked up. I've been driving for a week now and it's not shutting down but I still get the rpm drop to 400 at stop. So far it's recovered, but I'm worried that something still not right.

Any thoughts or similar experiences? AI dive says Vacuum lines test or idle control valve. I guess I'll be taking it back, but it doesn't happen on command.
 

AWAR

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Take it back for a followup. Might show something more in pending codes. Get the codes and we can see what it sees.
 

99WhiteC5Coupe

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My 2017 Limited for some time had been randomly dropping RPMs at idle. It'd be like when sitting at a light or coasting to a stop. The motor would drop to around 400rpm, then catch itself back up. This went on for some time till finally it didn't catch itself and the motor cut off mid-driving. Fun times.

Took to my local shop, scanned errors indicated bad fuel pump. They dropped the tank and replaced and put back together and the issue happened when they test drove. New error indicated throttle body bad. That was replaced as well and truck was picked up. I've been driving for a week now and it's not shutting down but I still get the rpm drop to 400 at stop. So far it's recovered, but I'm worried that something still not right.

Any thoughts or similar experiences? AI dive says Vacuum lines test or idle control valve. I guess I'll be taking it back, but it doesn't happen on command.


If the shop replaced the fuel pump and throttle body assembly, and the problem still exists, they replaced items that were not defective (or installed a defective new part).

I’d return it to the shop.
 
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