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Discussion Starter · #1 ·
On 95 Suburban - Yesterday I started getting the SES light come on at slight acceleration (ie, on crusie going up small incline) but once the accelerator backs off the SES light turns off. On hard acceleration (ie, to pass) no light but get black smoke. Ran scan tool and get a code 78 - Wastegate Curcuit Failure. Any suggestions? It seems as though vaccum is OK...
 

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