doubt its an igniter problem, in 99% of cases they either work or they don't.
what plugs are you using? they may be the wrong heat range, also what are they gapped to?
what mixures does it run at idle and on coldstart? at toyotafest it looked waaaaaaayyyyyy to rich when you were leaving.
how are the accel enrichment maps set?
could be many things but without plugging a laptop in and having a look its like playing dodgeball in the dark, very hit and miss.
cheers
linden
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