I would appreciate anyone's help regarding my check engine light. My 99 Millenia was running fine until I pushed her through the mountains in high heat. I stopped for gas and noticed the light came on. Now, idles high until the engine is warmed up(1-2 minutes) and drops down to 500 rpms. The light was flashing for a day and then stopped. Currently stays lit, but doesn't flash.I checked the ROOM fuse, which was fine. Gas tank cap is secure. While at the stop light, the vehicles drops down in rpm's and jolts forward slightly after about 30 seconds. I don't know where to start. Transmission or electrical problem?
Tx