Check engine light

Do you know the actual code(s) it has? That would give us a starting point. What has been tried to resolve the problem?

https://www.2carpros.com/articles/ford-lincoln-mercury-obd1-1995-and-earlier-diagnostic-trouble-code-definition-and-retrieval

Okay, if you can't find a vacuum leak I would check the fuel pressure and make sure it's in spec. For that you need a test gauge and the fitting, that car has a test port on the fuel rail which makes it easier.

This gives a guide on how it's tested:
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator

For that car the spec is 39-45 PSI with the key on engine off and 30-40 PSI with the engine running. If it's below 30 it would still run but likely set a lean code because of the low pressure.

Most shops will be able to do that testing, however there is no adjustment with that pump design, if it isn't correct it means replacing the fuel pump. On your car that means to drop the fuel tank and replacing the pump.
As for being a mechanic, the tools needed to do the test can be found at many parts stores as loaner tools and the test port connection is about the same technology as a tire valve stem or screwing a nut on a bolt. Just trying to save you money by testing it yourself, and possibly keeping you out of a shop that may just decide to change parts just because they can charge for them.
As for recommendation, I cannot tell where you are, and because we answer questions from around the world it would be very difficult to tell you of a place to go, for that I would ask your friends family and neighbors about where they go and see what they say.