Bravo 1.4 active loss of acceleration

[Andy mcguire]

Hi guys I have a 1.4 active 90 bhp 2007 the last 2 days it has started to stutter on acceleration then it drives as normal it tends to happen at lower revs unsure if it could be something as simple as spark plugs or a failing coil but just had someone say it could possibly be the throttle body which new are more to buy than the car lol 400 pounds up any ideas where I should start as I doubt a diagnostic machine would pick it up as no warning lights or messages yet also where would I find the throttle position sensor thanks for any help also I have always used the better fuels from Texaco or BP however I filled the tank with Asda petrol around the same time could that be the cause ?