I am having the same issue also. I have replaced the TPS with same OEM. Throwing codes PO1222, PO2222. I am stuck. Hard start, when it does start. Sometime (most of the time) it cranks and then shakes like Elvis, (younger Elvis)
. Sometimes it has a hard idle when it's running. Idle up and down all over the place. Then at time it's smooth like we like. She'll run for about 25-30 minutes then out comes the shakes.
I have done the throttle body adaption and it works to get the idle steady. How ever it goes to EPC light, ABS light, check engine light and then loses power. Sometimes at acceleration sometimes just babying the pedal. At times my Vag tells me 300 series which is random misfires on crazy idle shake land. Then once I turn her off and start her back up ALL codes are gone, until she shakes, rattles and rolls.
What has been done in the last month on 2003 1.8T Q 105K driven less than 100 miles since.
OEM fuel pump
OEM fuel filter
OEM fuel pump relay
OEM Bosch O2 sensors bank A and B
OEM Bosal Cat convert
OEM Purolator Air Filter
OEM Throttle Position Sensor
OEM Silver Star Battery
OEM Spark plugs
OEM Coil Pack ( new Hitachi revision)
Injectors, throttle body, Inlet hose, Intake hose, MAF sensor, have plans to Seafom the manifold, and fuel line, then change oil and filter.