I have a 2002 Audi A4 Quattro 1.8t 5 speed. When i go WOT It’s sputtering while building boost But when i go from 3rd to 4th it’s stops at 4K and misfires and causes the CEL to flash. I’ve put in a new maf, coilpacks and tested for boost leaks and no avail smh. I haven’t changed the spark plugs yet and there the “NGK iridium plugs” and i also have a APR 93 octane chip, test pipe, apr exhaust I ran codes earlier today and came back with these codes. I already have the new thermostat housing and lower coolant temp sensor OTW. Please help me figure this out guys!