Background: 2005 6.0 350. It has the EGR delete, ARP studs, new injectors, 180,000 miles, new heads, Superchip 1805 on Mileage Saver.
Problem: Some times when cold it will studder until it heats up then will stop. Shakes pretty bad until it reaches normal running temps. 90% of the time it stops shaking once warmed up. Some times it doesn't. I had this issue and it's why I replaced the injectors. I pulled the codes before the change and they were P0261 cylinder 1 Circ low*and P0263 contribution balance fault. Pulled them yesterday and now have those two and this one. P0279 cylinder 7 Circ low. Any help would be great. It is driving me nuts.
Problem: Some times when cold it will studder until it heats up then will stop. Shakes pretty bad until it reaches normal running temps. 90% of the time it stops shaking once warmed up. Some times it doesn't. I had this issue and it's why I replaced the injectors. I pulled the codes before the change and they were P0261 cylinder 1 Circ low*and P0263 contribution balance fault. Pulled them yesterday and now have those two and this one. P0279 cylinder 7 Circ low. Any help would be great. It is driving me nuts.