Thanks for that advice Scott. Ruby307

My Nissan Micra started having problems a few months ago. It's been into the garage a few times, and has been fully serviced, and the problem still persists. Basically it 'kangaroos' sometimes, and loses power for a few seconds, possibly as if not enough fuel is getting through. I have had the petrol pump replaced and the battery and belt for the alternator. My brother suggested putting in some 'Redex' as he thought it might be 'sticky valves' with it being unleaded fuel. This seemed to help a little, and I put some Redex in each tankful now. The kangarooing and loss of power happen on a completely random basis, not in any specific circumstances. It can be fine for days, then have a few days of playing up. It does it more on long journeys (over one hour). The problem sometimes seems to be associated with changing demand on the accelerator, eg it can play up after driving along smoothly for a while and then being stuck in a traffic queue, or after going round a sharp bend or over a humpy bridge it then can play up when setting off onto a smoother stretch of road. But as I said, this is all very random, it doesn't play up every time in those situations. Also sometimes the car stalls just after starting up in the morning (it starts fine) or can stall sometimes if waiting in traffic for a few minutes. (The year is 1994, M-registration in the UK, approx 120,000 miles, 998cc engine). Please help as my garage seem at a loss and I can't afford endless trips to the garage on the off-chance they can find what's wrong. Thank you!

My Nissan Micra started having problems a few months ago. It's been into the garage a few times, and has been fully serviced, and the problem still persists. Basically it 'kangaroos' sometimes, and loses power for a few seconds, possibly as if not enough fuel is getting through. I have had the petrol pump replaced and the battery and belt for the alternator. Mr brother suggested putting in some 'Redex' as he thought it may be 'sticky valves' with it being unleaded fuel. This seemed to help a little, and I put some Redex in each tankfull now. The kangarooing and loss of power happen on a completely random basis, not in any specific circumstances. It can be fine for days, then have a few days of playing up. It does it more on long journeys. The problem sometimes seems to be associated with changing demand on the accelerator, eg it can play up after driving along smoothly for a while and then being stuck in a traffic queue, or after going round a sharp bend or over a humpy bridge it then can play up when setting off onto a smoother stretch of road. But as I said, this is all very random, it doesn't play up every time in those situations. Also sometimes the car stalls just after starting up in the morning (it starts fine) or can stall sometimes if waiting in traffic for a few minutes. Please help as my garage seem at a loss and I can't afford endless trips to the garage on the off-chance they can find what's wrong. Thank you!