Car dies when coasting in neutral

[MustangGuy23]

So they "forced a file" in it when the car had a big vacuum leak. Then you fixed the vacuum leak and still have the "forced file" flashed to it? Maybe they changed some parameters based on the vacuum leak and now that the leak is fixed it's all FUBAR and you need to start from step 1. This could also be all exacerbated by you shotgunning a whole bunch of parts into the car without figuring out first what's going on.

Do you have a device that reads the ECU? How do the fuel trims and AFR look when the car is running like crap?

so here’s some data when it would die when coasting, the car is acting ok right now but again the idle right when it cranks is a little rough and the rpm’s fluctuates when ac is on. Other than that it didn’t stall when I drove today.

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[DougS550]

so here’s some data when it would die when coasting, the car is acting ok right now but again the idle right when it cranks is a little rough and the rpm’s fluctuates when ac is on. Other than that it didn’t stall when I drove today.

What did Wengerd tell you?

 

[John Papageorgiou]

So they "forced a file" in it when the car had a big vacuum leak. Then you fixed the vacuum leak and still have the "forced file" flashed to it? Maybe they changed some parameters based on the vacuum leak and now that the leak is fixed it's all FUBAR and you need to start from step 1. This could also be all exacerbated by you shotgunning a whole bunch of parts into the car without figuring out first what's going on.

Do you have a device that reads the ECU? How do the fuel trims and AFR look when the car is running like crap?

Like someone else said, for a health check put the Lund tune back on and log it for Lund. They’ll probably find any issues pretty quickly.

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