Hi, last night on the highway my Tahoe started to stutter in gas operation (Tartarini sequential plant Turbo 8), after switching to petrol operation that was gone. At the same time the heating failed. Since no documentation was provided with the Tartarini system, I know very little about its function and can not really establish connections in case of vehicle disturbances. Whether e.g. stuttering of the engine in gas operation and heating failure are causally related, I can not wi Perhaps you could judge this – I hope for example on DonC I have now written to Tartarini Germany via email and asked for documentation about the designation and task of the installed units, troubleshooting and functional principle. I think that in the case of such a large-scale intervention in the engine technology a documentation should be taken for granted, even if I would never fiddle about the gas system myself. However, I must at least be able to decom whether I go to the GM dealer with my heating problem (which will probably have zero idea of the Tartarini plant) or to the installation operation of the gas plant, which certainly does not have the GM-specific diagnostic equipment and GM-trained employees. I see again that the one pushes the problem to the other and I stand like stupid in between. Thanks in advance wogro