2004 Mazda Tribute Question: No Check Engine Light illuminated Power Loss

check for restricted exhaust (low vacuum or MAP sensor reading).

Code's? Will help you. Get them read.try and see if gives a code?

My 2001, had check engine, I pulled over 30 secs. later, it was running rough, apparently the cat.converter was blocking the exhaust, could expel exhaust, so it backed up into the engine and blew a gasket. I saw on YouTube, a mech. checking the pressure before/after the Cat. with a pressure gauge. See if they can check the cat. Jstone-Driver's Ed teacher, my car was 14 yrs old, 172,000 miles. I don't know what to do now.