Could be a faulty igniter (the GE motor also uses this system) or a fault within the distributor/rotor arm...
Hopefully this link will help with what to look at & where Mr. T has it hidden http://www.cygnusx1.net/Supra/Librar....aspx?S=IG&P=1 hth
EDIT-: More specifically, this checklist should get you sorted http://www.cygnusx1.net/Supra/Librar...Section=IG&P=5 Follow that baby & you'll find the problem in next to no time 
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'89 MA70 Supra GT aero 3.0turbo JDM, Rebuilt motor, K&N intake, 3" stainless turbo-back. New turbo and braided line kit...
'89 Honda NC27 400, NC23 cams, open pipe, PC36a shock & possibly Showa USD forks...
'83 Yamaha 29R XJ750E-II, number 69 off the line, only runner in the country? Original except Koni shocks
'95 Honda PC26 CB500R, Winter hack, hateful, trying to sell it
I'm not paranoid, they really ARE after me!!! 
Last edited by MA70-3.0GT; 12-31-2010 at 07:52 PM.
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