First, I'd suggest that you purchase a Haynes Manual. If Old One and I82roadster are reading this, I'd suggest the same for them. There are several versions. There's the small handbook, just a little bigger than a Readers Digest, then there are 2 full-sized versions. Version 79008 (1232) doesn't have the updates in it, that covers some of the changes that were made during the model years. It also doesn't have some info for the 88's. That number is in the upper right front corner of the cover.
I interpret that your check engine light comes on only after driving, but not while sitting at idle. With that, first thing I'd check would be vacuum leaks. I just read a thread that suggested spraying brake cleaner fluid over all your vacuum lines but cautioned to have a fire extinguisher readily available. Simply said--DON'T.
However, you can use a small hand held propane torch. With the engine at operating temp, turn on the torch but don't light it. Pass the nozzle slowly along all vacuum lines and connections. The engine will gain rpm when you get to the vacuum leak. I've used this many times, and have only had one ignition. I passed near an arching spark plug wire and it lit the torch. No explosion, it just lit the torch.
I've tried to find the number for the correct Haynes Manual, but can't. Robbie, if you're reading this, the book you have is the correct one.
