GMC Troubleshooting Questions? Ask a Mechanic for Answers
Hi, welcome to Just Answer. I’m Ron and I’ll be helping youtoday.Before we get started though, Please understand that I don't knowyour skill level or tools you have to assist us. Also understand thatI can't see, smell, hear, or touch the vehicle either, so patience isappreciated. JA is a great Q/A site, but it does NOT replace arepair shop.My goal is to make you happy and get a great rating in return formy time. Sometimes I have to give you bad news that I know youdidn’t want to hear, so please don’t shoot the messenger.
Check CRANK and CAM sensors with a scope to be sure they look right. See attachment I sent to you.
A scope is needed for this, there are no shortcuts. We can guess at it all day and spend needless money by replacing a bunch of good parts. I want to help you, and we need to see what it's doing.
Thanks again, and please don't forget to rate me and keep this link in case you need me again later on.