i have a 94 liberty wagon awd automatic fitted new knock sensor after hard acceleration up to 110 klm per hour it starts to run roughly and no power happens on way to work and when I stop at traffic lights almost stalls feels like you have to push in the cluth peddle but its auto so slip into neutrel and takes about one or two minutes to clear itself ,have just seviced radiator due to a small brocken pipe near injectors ,had to drive couple of klm with no coolant and it ran verey rough due to no coolant on injector temp sensor but didnt cook motor and and also temp varies alot were this did not happen before radiator sevice fans start at 68 degres celcias new spark plugs fitted , had the computer checked and cleared that showed no faults, tried injector cleaner