@Jamplu,
Your input has been valuable and thanks so much.I was zeroing in on MAF but wait until you here the problem.
@Digitek,
You were right.Very right my man.I was looking in the wrong place.
@Mlefu,
Ungirohia nda ugichunga.
@Impunity,

I am going back to my Bijuti.Hii Ndijito ni ngumu!
Problem solved.Here is what happened.Some weeks back,the bonnet cable detached from it's lever with a damaged retainer hole.I decided to change the lever and the guy who did the job did not secure the plastic cover well.The cover is usually insulated with lagging material (Anti-heat).Seems as i used the car,this lagging material ,aided by the loose cover finally found it's way to the front of the second acceleration lever and wedged it forward thus pushing the accelerator in.......After securing the cover,all went back to normal.relief nayo?....So Digitek was right,only that i was looking from under the bonnet.Cheers all and thanks.
Nothing great was ever achieved without enthusiasm.