Had my truck out and running around over the weekend and ran great up until I went to drive home...... It has had a no hot start issue lately and being an 03 im guessing its somewhere in HPO rail and I have been running an SCT canned street tune on it with no issue up until now. It is throwing a number 2 contribution code and has a horrible miss throughout the RPM range. Could this be caused by HPO leak getting worse or is it a sign of a different problem? When I backed down to just a trans tune the miss went away but I dont want to keep driving it if more damage is possible. Truck has 213,000 miles and recently had the oil cooler replaced and egr delete with warren diesel injectors put in around 5k miles ago