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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.
Once it starts, is there exhaust smoke or a misfire?
What liter engine?
Have you checked the fuel pressure prior to using starting fluid or checked for injector pulse?
You mentioned it runs rough for 4 minutes. If it is not misfiring can you explain how its running rough ?
Thanks, ***** ***** the fuel pressure is slow to rise causing this from a weak pump or restricted filter or you have something leaking into the combustion chamber while off, like the injectors leaking, oil around the valve stem seals, or coolant from the head gaskets. All of these could cause what you have occurring. My suggestion is a compression check to rule out the head gasket and compression issues and valves sticking. Next would be a fuel pressure check. Sometimes just old worn out plugs can cause this since when starting everything has to be optimum at the lower cranking speed compared to engine running speed.
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