Hey guys, as the title says. I went to get my car tuned in December and wen they ran it up on the dyno it was shutting down at 3000rpm and wouldnt rev more.. Then another 5 tunes then I went to 5000 RPM and wont go any more.. I can figure out what the problem could be.. I have change 3 sets of coil packs 3 sets of spark plugs, changed the fuel reg and.. Has this happened to anyone before??? Cheers Pete