Ford Repair: 95 thunderbird ignition, plug wires, road test

Question
Had a diagnostic done, During road test, there was a missfire on #4 & #7 under load. It's running poorly , not much power . They recomended left side coil wich I have allready replaced. Did not solve problem. Also MAF sensor has a continuous code for low voltage ???? I took it off and cleaned it . Any suggestions?  

Answer
What engine and trans? If it is a 4.6L the most common problem on these is spark plugs wires. The second most common is the MAF sensor. Try disconnecting the MAF and drive it, see if it makes a difference, if so then the MAF is faulty. I would suspect plug wires since you have misfire data.