The above-mentioned vehicle has 3.3L engine and recently rolled over to
200k. The engine runs great, but occassionally the "check engine" light comes on when driving more than a few miles around town. When driving on the highway, it comes on at about 10 miles out and does a little sputtering now and then and runs a little rough.Can anyone tell me what this might be? I'd like to pick your brains and get some opinions here, before I take it into the shop.
Thanks in advance, Brigitte