So, I buy my A4, change water pump, change timing belt, replace MAF, fix minor radiator leak, fix minor vacuum leaks. Car runs great!!! Change oil, take on 1st 3 hr road trip. At stoplight at Exit ramp, high rev during downshift, then car stalls out for a sec, and without turning key, comes back to life but with serious misfire and hard shifting in 1st 2 gears. Noticed minor oil leak at top/rear of engine block closest to firewall. Im replacing cylinder gasket soon. Changed spark plugs, changed coil packs. Still misfire in both cylinders 1/2. Don't know what to do next?? Any ideas??