This 2015 Jeep Grand Cherokee is not drivable because there is no throttle control and it's also having a very long crank before the engine actually starts running. This issue can actually happen with any vehicle using the 3.6 Pentastar Gen 1 engine. This first part just covers some testing strategy to get you on the path of finding the issue.
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Topdon Phoenix Smart
https://www.topdon.us/collections/diagnostic-tools/products/phoenix-smart?ref=SEZpOAa8Cf_j7V
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