Need some help/info
 

My wifes 1994 K1500 Turbo has been acting up! It will act fine for days/weeks even and then all of a sudden it will rev up sometimes to the point where if your at a stop light you had better have a good hold on the brake! We have had it in to a mechanic but he "can't recreate" any of this and wont show any issues on his computer... What can be done? Anyone ever hear of this before? I thought that there might be an issue with the cruise control and pulled the fuse for it but wasn't sure if it didn't do the accelerating thing because of the fuse out or just wasn't acting up that time... It's come to the point where she is terrified to drive it (I don't blame her) please someone HELLLLLLLLLLLLLLLLLLLLLLP

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Nobody? :argh: