Problem by idol
 

My car have idol problem on 3 gear between 6000rpm to 7000rpm, when it on 3 gear it the idol stop on 6500 rpm doesnt going up.
And after this problem I just change all new spark pulgs. And it still happen the same problem. Does any one know what is the problem???? (I put 87 gas after Scotte tune the intercept X for me)
In 1, 2 gear it run normal. Only 3 gear stop at 6500 rpm, and engine sound like not allow to go more up.
I have changed Mazsport intercept X and Masport ignition solution on my car.
And mazsport is out off business, where i can find the people they know about this kind problem???