The Scottsdale has a W22 Chevy Workhorse with a 8.1 liter Chevy motor, I haven't had the codes read, digital display reads "low engine power" or something like that I do not have the unit with me it is at a RV workshop having roof repair, various electrical etc. and the owner said it would start but no throttle response, he took off battery cable and it worked for a day or two then again, start and no throttle response, from all I have read, it seems to be the throttle body modulator, ??? any help would be great I am at a loss and believe it is GM specific and it needs a GM analysis? that means find a dealer and a tow?