Ok, Got a 94 park avenue, drove it to Mpls from Bismarck. Ran fine the whole trip with getting on and off at rest areas and all that. Once I got into Mpls and picked up my daughter and let it idle in the driveway for about 15-20 min went back to get on the highway and it started to sputter like it was vapor locking, It almost seems like the computer is not readjusting the fuel injectors from highway to street speeds. How do I check for codes on this car? And where is the ECM? I am thinking of changing out the ECM to see if this fixes the problem. The car ran fine again once I shut it off for a few minutes.\

Thanks
Tim