Engine light coming on

I have a 91 Ford F150. The engine was rebuilt about 70k miles ago. The original engine had around 120k The car blew a head gasket. The car was on loan to my sister. I had it towed to the shop and he "fixed" it. 800$

Driving it home the engine was not preforming right. My sister has been doing the driving so I am just repeating what she said. She took it back to the mechanic and he "fixed" it by changing spark plugs and plug wires. 30$

After getting the car back it still didn't drive right. She took it back and he said it was water in the distributor. $50 Now it seems to be running OK, but the engine light will come on. There is plenty of oil. The light will come on for a min to about 3 min and go back off.

The mechanic says to bring it back and he will put it on the diagnostic machine.

I kind of want to cut my losses with this guy and take it somewhere else.

Anyone have suggestions?

Thank you for you time

You could start by giving a solid description of what is actually not working right for you. "Engine not performing right" could have a million different explanations. What is happening? Have you driven it? What exactly does it do(or not do)?

What you have posted so far gives us nothing to go on. It would be like me giving my car keys to my neighbor and saying "Take my car to the shop and tell the mechanic it isn't working right". You need more info than what you have provided so far to even get started on what could be wrong....

Since the mechanic changed wires, and plugs, and then said "Water in the distributor" I am lead to believe that the engine is misfiring. How bad? Same cylinder? Random? Does it look like he actually changed the plugs and wires? How about the oil, how does that look? Pull the dipstick..does it look like a milkshake on there? Water and oil mixed = big trouble. If that's what you see you have bigger problems than anything a simple tune-up is going to address.

Chris