I have a 2006 mazda tribute manual...when the engine is running low rpm...there is a cloinking noise when you press the gas pedal and release the clutch pedal........

SOURCE: 2006 Mazda Tribute: Gas pedal keeps sticking when I excelarate!

locate the cable from the motor. disconnect,hold up high spray wd-40 into cable,lots cause you want it to run all the way through

SOURCE: looking for front end parts diagram for 2006 mazda tribute

buy manual, clean or replace speed sensor at wheels

SOURCE: 2005 Mazda Tribute gas pedal freezes in cool

Throttle cable could be binding inside the housing that attached to the throttle body. Also the throttle positioning sensor could be faulty as well.

SOURCE: stuck clutch pedal on a Mazda B series truck

Replace both clutch slave and master cylinders, and bleed well. I've also had this happen.

SOURCE: gas pedal unresponsive

Try this: Go to your local parts store and purchase a can of (throttle body cleaner) you will take your air filter out and remove the big tubing that is connected to your throttle body and filter housing. Spray the cleaner inside the throttle body, open the (butterfly) and spray around the pivot the butterfly opens and close on. What happens is you get carbon build up in these areas and it causes the gas pedal to feel like it's stuck and have to apply more pressure to the pedal. You will see alot of black carbon run out of the throttle body. Take a clean rag and wipe down the area of the throotle body. Repeat the cleaning 1-2 times. put your air inlet tubing back on and re-install your filter. It may seem hard to start at first but it's drying out the cleaner that was sprayed inside the body. Try this and see if this works. I've done this on many vehicles that shops want to charge $300 to do and all you need is $5 cleaner. It's very easy to do and takes 20 min.