2006 300C 5.7 slow deacceleration, like cruise control on

[ivanford]

U7135, 9r17, 2006 300C 5.7, all stock, no cai, no exhaust, running 93 octaion tune, with only tyre size changed, all other settings stock.

When coasting up to a junction or stop light, from say 40mph the car takes for ever to slow down, it feels like the crusise control is on, which it isn't.
I don't think it would stop on its own for miles on a flat road without the brakes.


I thought it might be the shift firmness, but I put it back to stock setting and no difference.

Loaded the stock tune and it was fine.

Any ideas, or is this a feature of the Preadator tunes? I don't really like it like this. It will stop and idle perfectly in drive when you brake.

[shark7000]

I have the same problem with my U7136, 06 Charger 3.5, duel exhaust, Flowmasters mufflers and tips, CAI, 20" wheels. I lowered the idle tune to go down 100 rpm, it was ok for a while, but it's now wanting to stay around 1200 rpm in a parking lot, or just cruising in town at low speeds, until I step on the brake to stop. Before, it was revving up to 2200 rpm. I restored to stock, then did 89 octane tune, and reduced idle down 100. I did the 100 rpm reduction because with the tune it caused the rpm at idle to go up to 850 rpm. My gas mileage sucks. I'd get better gas mileage with the Hemi. I only get about 8-9 in town, but with the tune, it went up to 19 on the highway, from 14 mpg with out the tune. Using the Jetchip gave me 16 HWY. I do have over 236,000 miles though. I was thinking my poor gas mileage could be that I need a valve job. Not sure until I do a leak down test. But the surge at idle is not good. Stock was really sluggish on take off, but with the Predator, it's much better, but still sluggish between 2k - 29K. At 3K it scoots, almost like a 2 stroke dirt bike when it hits the power band.
I also have the latest version of software installed on the Predator.

[speedrules1]

Chryslers have always coasted well use to your advantage to save fuel ; )

[shark7000]

It's using lots of fuel, 9.22 mpg in city, and when I want it to go slow in the parking lot, it's speeding up to over 1200 rpm and about 25-30mph, when I want to go 10mph. I have to actually step on the brake to get it to slow down.

[HalsMag]

Ivan,
What's your PCM flash end in?

I was fine on decel until flashed to PCM file ending in AL. Now the car doesn't cut fuel and stays at stoic during decel, like you're describing.