I am trying to get my 88 turbo coupe ready/registered for spring. It has 221k miles (mostly highway as a daily driver for the past few years), the 5 speed shifts smoothly and the car has plenty of power. The car runs great and fuel mileage is excellent, but my check engine light is on. The only symptom is a *slight* hesitation when first starting, but this would be un-noticeable for those who didn't know the car. The check engine light goes off, then comes on/stays on after a few seconds.
KOEO test gave error 22 (BARO out of range).
KOER test gave error 22 and error 34 (EGR did not respond).
I replaced the BARO sensor and the EGR valve with new ones and still have the error. My hunch is that the EGR/EVP sensor may be at fault, but I haven't checked it yet. I don't want to replace parts needlessly, but I need to get the CEL to go off so I can get the car registered.
Any advice on which direction to turn/what to try next?