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"All cylinders have 120 psi compression." I would be seriously concerned about this. Typically, an engine's compression should be much higher e.g. 180 psi or more. Could mud have gotten into the exhaust system causing restrictive back pressure?
you need to do the fallowing : - make sure that you donr have a n oild leak some where look under the car - u have a missfire in cylinder number 5 ( it colde be the spark plug or the coil ) if you wana go cheep , start by buying 1 spark plug and change it in number 5 if fix the problem ok if not , get the coil and change it
Usually gas gets in the oil if you are having a hard time starting the vehicle, or turns over for a long period of time before firing. It floods the cylinders and bypasses the rings filling the oil with gas. You may want to change the oil and filter and see if this problem continues. Check your plugs, wires etc.. If it does then your rings may be shot not giving enough compression to the cylinder causing un burnt gas. Try a compression check and see if you have any bad cylinders. Depending on the vehicle 90-160 psi isnt uncommon. If there is a great differential between the cylinders you may have faulty head gasket, bad valves, or just worn rings.
get a scan tool to retrieve the dtc (diagnostic trouble code).
you will get a misfire code.
p0301 for cyl 1
p0302 for cyl 2 and so on.
i can't recall if that engine has plug wires or coil on plug but if its coil on plug replace the coil corresponding to the cylinder misfire
With a new plug and fresh gas it should start. Check to make sure there isn't a kill switch turned off or that the gas petcock from the tank to the carb is on.
How did you check the fuel filter? Disconnecting it from the fuel line that goes to the carb is the best way, making sure the gas is turned on under the tank. Bleed off a little gas into a can or something just to make sure the filter isn't plugged.
The last thing I'd do is take off the air filter and spray a little starting fluid in the carb. It may start and run several times if there is old gas in there somewhere. Remember the bowl on the carb is probably still full of old gas. After some fresh fuel reaches the plug it should start and continue to run.
(You might drain the bowl on the carb of ols gas before you go any further)