HI ,I bought a Dtuk tuning box for my VW transporter 102 BHP T6 and I've been experiencing some problems with it it seems to have developed ashudder or misfire and despite changing the Modes up and down it just appears to be getting worse I've checked all the connections and everything seems to be correct so I've now just removed it just in case it would cause any damage I'm just wondering if anyone else on this forum has experienced similar problems with these boxes