I have a 1997 Plymouth Voyager with a 3.0L. After purchasing the vehicle the "Service Engine Soon" Light came on. I pluged in my OBDII scanner and it returned a Misfire on cylinder number 5. I gave it a tune up and it didn't help. The plugs and wires were original OEM. I took it back to the dealership where I bought it and he didn't know anything. He told me that he gave it a tune-up because it looked like it had old wires and plugs on it. So realizing that he was an idiot I took the vehicle and pulled a compression test on it. Came back good. Is there anything else that I might do to fix this solution? I need help with this one with out spending a fortune on this damn thing. Thank you

Does this engine have ind. Fuel injectors? If so there might be a problem with the infector, fuel supply or wiring leading to it. If not redo compression check and see how long cylender holds compression. You are looking for a good five minute hold without bleed down. Fuel, air and spark all timed right is all you need in order for it to fire. One other easy check is to remove the plug wire while it is running and see if it changes engine performance. If it does not hold end of wire near something metal and see if you get good spark with loud anap.

Will try something else