I run all PW Lionel engines the conventional way and E units can drive you nuts. I am no expert but some things I have found: does the plunger rod in the solenoid go up and down ? They can collect gunk and stick. The cylinder can also get gunked up. Also, more serious, the pins on the end can wear and it gets cockeyed and won't turn right or the ratchet teeth are worn. Also, your commutator might be too dirty and the divides between sections need cleaned. First thing I do when I get a "new" engine, even if it is running, I take the spray cleaner in a can for electrical parts and give everything a good wash. the solvent is non-flammable and will let your motor run. Has helped solve a lot of prblems for me. Good luck
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