So here's the deal, I Bought this car around 8months ago with a bad timing belt. Long story short I rebuilt the heads everything's all hooked up I'm getting spark and fuel to all six cylinders. I started it with no serp belt on and the battery is pretty so so. But still decent enough to start it. It idles pretty descent revs super slow. Ran it for about thirty seconds then felt the passenger side manifold it was warm. The drivers side was cold. Now what's really got me confused is that the car is auto with tip, when I turn the key to the on position it says press clutch before starting. When I first got the car it never said that..so I'm wondering if the ecm is bad? Any input would be great because I'm beyond stumped!