93 Octane

Fluctuating Revs, Light Throttle

Fluctuating revs when under light throttle. No factor in load or no-load, engine or ambient temps cold or hot. Thoughtful this may be an underlying symptom of bucking when colt, very small hiccups when cruising. Fuel is actually 92 octane in Oregon. Only modifications are exhaust down pipes and filter cone intake. Jb4, problem arises when map 0 or 1. Plus and coils replaced 10/18, have 15k mi I12 Injectors replaced 3/19 and have about 8k mi Seems to be early stage of problem and is recent in last 1k miles.