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Discussion Starter · #1 ·
I have a 99 ZL 500 and if it sits for more than a few days the EFI is really slow to wake up. When new it was 2 pulls without fail. Now it rumble/runs slowly for 10, 12, 20 pulls before it finally takes off.
Once started runs flawlessly. Restarts when warm/same day just fine.

Bad ECU?
Any ideas other than a new $$$$$ ECU?

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