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Welcome, I'm Chris (aka Moose). Experts aren't employees / agents of Just Answer. We are independent service providers using the Site to sell their Expert knowledge to Customers. I strive to provide EXCELLENT 5 STAR service, let me know what's needed from me so your pleased.
What liter engine do you have?
Are you behind on any maintenance like filters, or tune up?
Thanks, ***** ***** due for new plugs, you will want to do that since plugs worn out can cause the issues you have mentioned. I would also like for you to monitor the fuel pressure while driving, running pressure should not get out of the 28-45 psi specs.
For the data link not allowing connection confirm:
light blue/white is power
black/white is ground
black is ground
If these are good then let me know because there are network tests to perform next.
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Thanks so its not the ignition system or fuel system to blame. When running rough is it just bogging down or misfiring?
Can you do the steps below to get the data link connector working.
I doubt its the PCM bad.
Can you clean the MAF sensor.
30-35 is enough pressure.
Since the scan tool will now communicate. What is the MAF sensor reading at hot idle as well as the fuel trims?