In March I was towing my horsebox 1000kg with a 700kg horse and a 200kg pony so below the towing capacity. I was on a motorway in 5th gear cruising along when I noticed thick black smoke coming out of the exhaust, next thing the car began to accelrate by itself, I came off at the next junction and it seemed fine, I got back on the motorway and shortly after it done the same again. I came off the motorway and the rev's went to 6000, I paniced and turned the engine off as I thought it was going to blow up, it was rolling down a hill and wouldn't start again but then started once I had stopped at the bottom.
The car went back to the garage I bought it from who believed air had got in to the fuel system, they contacted me to say everything was fine with the car. I have since used it in everyday driving and also towing. On Sunday 17th April, I noticed the rev's were idling at 1500 when usually it idles just below 1000. I started driving the car with the trailer on with the 200kg pony in and as I was approaching a dual carriageway in 3rd gear it started blowing black smoke out and again in 4th. My partner thought I was imagining it so he then drove, he got the same problem but thought there was a loss of power alongside the smoke. I have sent it in to the garage again.
Does anyone have any idea what the problem could be?
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