nova misfires

[nova_172]

my 1,2 SPI will blow most spark plugs apart from NGK R's but itstarts up with them in but will misfire and splutter, any1 hav any ideas
its not showing up as a fault code either.

[david dixon]

sounds like its totally under fuelling, is your spark plugs white or light gray when you take them out? if so get the engine set up before it melts a valve or piston.

[nova_172]

its firing only on 1 and 4 even after i have changed the spark plugs, distibutor and rotor arm, they are gettin fuel but are not sparking other plugs are fine, they jusshow its runnin a bit rich