tunning problems, last year after finding an ad in banzai magazine, i purchased a aem ecu from advanced motorsport and engineering, in silverstone, the price quoted was resonable, and they seemed recomended by the magazine, drive the car 100 miles to him for the tune, left the car with them about 1 week,and 300 miles on the clock, picked car up car sounded different but the drive home was nice, but soon after noticed starting the car was an issue, then it failed all together after about two weeks,rung them up and had to get car recovered 100 miles on truck to them, problem was diagnosed as lose down pipe and de cat i had fitted,and Also the plugs ihad fitted wernt burning the carbon off (denso iridium) plugs changed 4 bosch, repair work was carried out also had cam done whilst their,received car a further 400 miles on clock car bck 1 week with intermitent missfire, then not starting again, took all plugs out and cleaned, car going again, been ok for about a month but drive not as original, now took kids to zoo at whipesnade nr luton, got their fine, gearbox now playing up, joined ur web site yesterday to find out the the so mentioned fitter is not an approved in installing these? what can i do about this, have i been severly bumped, are these all tunning problems related to the aem instalation