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Q: tune up issues on 2001 Mazda Tribute

okay, I just did a tune up on my Mazda Tribute, initial issues was a misfire on cylinder 3 causing rough idle and slight vibrations...did the spark plugs, car was still having the issues, today I finished the coils(disconnected the battery terminals also), assembled everything in when it starts it idles fine then begins to idle roughly as if its trying to cut off!!! what could be the problem?
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did you make sure you attached all the vacuum lines??

you said you changed the coil. you may also have an injector issue as well. you have done all the basics now is the time to get an exact diag to the remaining issue before you spend unnecessary money.

yes made sure all the vacuum lines are connected where they're supposed to be...except one hose on the lower left hand side of my throttle body which I KNOW I didn't disconnect from anywhere...even spent 10 minutes looking for where it possibly leads , but I couldn't find a possible location...also when I shut the engine off heard a strange slight popping noise coming from the coils, then it slowly died out
make sure the big hose to the throttle body has no air leaks. that will cause the motor to do what you are describing. the mass air flow will not see the air going into the engine and the engine will run rough.

hello, i'm back...okay..after the coils issues, i just replaced the intake gaskets, lean code doesn't show up anymore, neither is the check engine light on...but went ahead and did some regular maintenance on it, fuel filter, changed the iac valve, new tps, replaced maf was running good except the gas mileage had decreased went ahead and changed the pcv and the the car had a bad idling issue..what could that be?
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