445 x torx Saw is a probably 5 years old. I cut a few cord last week with a crappy chain and saw seemed to run fine. Bought a new chain today and now the saw doesn't have the power and bogs down bc the chain is actually cutting good now. If I only use the tip of the bar it will rev good but as soon as I grab some wood it can only run about half throttle. It starts fine. I blew out air filter. I installed new generic fuel filter similar size from Napa before the new chain when it was running fine. May try a new one and also get a compression check.