I have a nightmare of a car. It came in with misfires on cylinders 2+5. I replaced coils and wires. Upsold a rear main, valve covers, and plugs. Finished the car it ran fine. Sent it home. 3 days later it came back she complained we did not fix anything because its still running rough. No codes what so ever. I went through pulled all the plugs again, ohmed coils and wires, fuel pressure is good , tried throwing a MAF at it, cleaned throttle body, smoke tested intake, cleaned EGR. I can't find a single thing wrong! It runs perfect during warm up but almost stalls once hot. Any suggestions? Wish I had an oscillascope to check injectors but I dont.