I have a 2011 Mazda 6 with 76,000 miles. OK car but nice to drive on interstate. In the last month, the power is definitely lower than previously. I changed the plugs at 30000 and 60000 miles with Iridium plugs and all was good until about 72000, then it dropped off. I have to nearly floor the accelerator to get it to downshift and then move.

The check engine light was on for 2 weeks and then went off. Code scanner shows no codes. Gas mileage is about normal, 27 to 29 mpg.

Any suggestions?

DOug

 

Why would the engine while accelerating bog down and loose power then regain all the power at once

 

I would do easy standard stuff first:
Clean MAF sensor, clean throttle body, and change the PCV valve (as Mazda never did).
While you are doing this re-set the ecu by disconnecting the battery.
READ: https://www.mazdaforum.com/forum/gen...setting-31827/
Re-start car and let idle for 10-15 minutes. re-learning has begun for next 50-100 miles. After this put in fuel system cleaner.