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MTH 20-3527-2 Runs fine smoke off. Runs jerky smoke on - FOUND CAUSE?

MTH Dreyfuss PS-3.  Runs 80% Loop OK.  Runs jerky on 2 areas.  Areas about 1 foot long.  When it hits the bad spots the amps jump up from approximately 3 amps to 6.2.

MTH Hiawatha PS-3 runs perfect for comparison. My other 20+ engines never behave poorly.   Trying to rule out track power.

I probably overfilled (I tend to) the smoke (about 20 drops).  With the loco smoke off I get perfect operation. On the loco motor, it sounds jerky, not smooth or steady when at bad area  Since it acts bad with smoke turned on I suspect electronic.  Let it dry out?  Or has someone experienced this?

Star wiring, ZW-L, up-to-date remote and TIU.  Signal all 10s.  Insulated power drops every 3 or 4 sections (approx. 36”).  

Last edited by Bryant Dunivan 111417
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