Engine Performance problem
1997 Ford Ranger 6 cyl Four Wheel Drive Automatic 135000 miles

From time to time my engine has started to run rough resulting in the replacement of some gaskets most recently on the intake manifold in May of this year.

Yesterday the engine started running rough again and I suspect that again there is an issue with one of the gaskets on the manifold. Over the years this problem seems to occur with the onset of colder weather.

Any thoughts on this as this is a relatively expensive repair. Thanks