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troubles after tune

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Old Apr 12, 2017 | 07:43 PM
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Default troubles after tune

Had a tune at a local shop. A hour and a half into the tune he stated the car started to break up and misfire under load. He didnt finish the tune. I took it home and now observing the same problem. took it to a local shop and showed misfires on cylinders 1 and 3. Replaced those coil packs with MSD coils pn MSD-8285 and the problem got worse, it now misfires on idle. Put stock coils on and runs fine at idle but still breaks up under load. Anyone had this problem or any ideas what it could be. Car is 2001 SS with Texas Speed 408 and TCI TH400.
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Old Apr 12, 2017 | 08:05 PM
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Gaps to big on the plugs?
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Old Apr 12, 2017 | 08:07 PM
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The tuner replaced plugs with NGK and tried again. Same problem.
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Old Apr 13, 2017 | 02:55 PM
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my bet is the MSD stuff is the cause.. I have consistently seen MSD stuff cause misfires.. best bet is NEW stock AC Delco coils, and NEW AC Delco or NGK plugs and wires..
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Old Apr 13, 2017 | 03:44 PM
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Well, What did you do to the car to need a tune? Maybe something there?
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