Just had new ATS stage 1 with triple loc T/C installed on my 98.5 with 185k mi. After a couple months of light driving, don't tow anymore, I started having problems with initial startup in the mornings only. Engine starts up just fine but as soon as I put it in gear it wants to take off like it's under a load and blows a lot of black smoke and I have to restrain it with the brake petal even though the emergency brake is still on. After I go down the road for less than a mile I can shut it off, restart it and it runs fine the rest of the day with multiple stops and restarts. I've taken back to the local shop, authorized dealer, that installed and they have yet to figure it out and it is not setting any codes.