tuning issue

[blckrevo33]

good morning everyone, here is whats happening,my revo runs good for the most part.this is the second time in a row i have had this issue,it will hold a general tune but when i am trying to fine tune it,it doesent seem to hold the tune. my question is would old fuel cause it to not fine tune very well? i am using traxxas 20%. i had about a 1/3 gallon left in it from last yr. the truck runs good temps i just can't seem to keep them consistant. i have a gallon of new traxxas 20%. should i just ditch the old fuel and run the new fuel? also it seems the lsn is where it wont hold a tune it will be graet off the line for a couple runs then bogs down on take off.other than that top end is great. thanks in advance for any suggestions

 

[jnjritz]

I don't like keeping fuel for more that a 3 or 4 months.I would run out everything you have in the engine. Pref dumping it out. Not adding any more of the old stuff. Then give it a couple good shots of WD-40, Then try your new fuel. See what happens. And let us know. Might even want to replace glow plug for good measure.

 

[blckrevo33]

ok i will try that and let you know thanks