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Q:

Engine loses power when excelorating
on 1999 GMC Yukon

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
Engine starts and idles fine, but stumbles when I press on gas, and won't cruise past 100 kph
(2) Answers
review when last tuned. it may just be due.
try oil stabilize in engine to recondition seals and cylinders. this will enhance compression.
use ethanol treatment on next fill up. this will clean any ethanol resins that may be inhibiting fuel delivery.
do fuel pressure test to check.
run diagnostic to find any other issues you should be aware of.
consider upgrading air filter to high air flow design.