20-04-2019, 09:17 AM
Hi JonE
It may indeed be a fuel problem, but misfire and poor running under load are also symptoms of a weak spark. If ignition voltage is marginal it may be just OK at the low cylinder pressures at idle, but fails to spark when cylinder pressure rises under load. Typically caused by a faulty condenser or coil, both of which can be worsened as temperatures rise.
It may indeed be a fuel problem, but misfire and poor running under load are also symptoms of a weak spark. If ignition voltage is marginal it may be just OK at the low cylinder pressures at idle, but fails to spark when cylinder pressure rises under load. Typically caused by a faulty condenser or coil, both of which can be worsened as temperatures rise.