Hi I have a mercury 4cylinder 1994 model 40 hp that is hard to start and will only idle when the key is constantly puch(squirt of gas from enrichment valve) I' thinking it time to re-build the carbs. The engine ran fine all last year but was getting harder and harder to start. I just want to see if you guys think the same or am I barking up a wrong tree? I value you guys' opinion. Thanks.....Robert