Hi I have a problem, my golf is stuttering when under load, I was going along the motorway in 5th and as I started to go up hill it felt as if the car needed to change gear, the gear stick was rattling and the car felt like it was slipping backwards? I changed down and it still stuttered a bit but carried on up the hill. There no engine management light on the dashboard, it's just doesn't feel right. I had a new coil pack 3 years ago, the ht leads have just been changed as have the spark plugs as I thought it might be that? No4 lead looked corroded inside and no1 spark plug was a bit off colour.... any other ideas?? Could it be anything to do with the exhaust as I believe my cat will need replacing soon? Thanks for your thoughts