Just tried some Redline S1 injector cleaner in my Echo for a similar problem. Hesitation, irregular idle and the occasional P0171 "lean" code. I'll have to wait and see. Glad to hear you're having success. Hope it's fixed for good.
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Almost all my driving is done 1-5 miles at a time.
Best short trip: 2.4 l/100 km, 3.9 km
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