I think you may be running too lean because of a stopped up carburetor. The plug wire, you can tape up with electrical tape, this is pretty common on some of these saws.
The part number for the carburetor isNNN-NN-NNNNand is available from any Poulan dealer. I have it listed at about $22 and that's about average. Poulan makes this saw for Sears. You can use any of the part numbers from Sears and save a little money by buying from a Poulan dealer.
I don't bother rebuilding these carburetors as for the price, it just doesn't make any sense. You'll spend about the same on a carb kit and cleaner as a new carburetor with none of the fuss of rebuilding.
It's very, very important to not run lean in a chainsaw. The carburetors are already adjusted lean from the factory to meet EPA standards so leaning out a little more will result in too little oil reaching the engine and in overheating.
Your symptoms could also indicate a vacuum leak from the carburetor seal or even a crank seal. But without the proper tools and block-off plates, you can't check these things. I would feel pretty comfortable in replacing the carburetor myself.
Let me know if you have any questions. Thanks, PK.