renault traffic 2002 reg 1.9 6 speed 110k
every time the van goes over 70 or 2000rpm when going under 70 the the coil light comes on and the van loses power and wont rev. switch ignition of then straight back on and all lights go of and the power loss is back to normal until the next time it hits 2000rpm or 70mph and so the cycle will go on. Van is used as taxis and ran 7 hours round the town yesterday with no fault at all but as soon as it went onto motorway back came the fault. Any ideas/suggestions/longshots