Ok I have a Plugger aerator. the brand is not what matters but the engine does. Ok now the specifics. Briggs intek IC 506 5 hp horizontal shaft engine that cuts out after 10-20 seconds with the air filter in. with out the filter in it runs fine. Ok It is running rich with filter in, so I suspect. I adjust the carb so it does not run so rich. same thing. what is the problem. it is less than a year old and has less than 20 hours on it. It is driving me nuts. Adjust, adjust and adjust and still no go with filter in. Now it ran fine with the filter in last year. Yes I changed the filter 3 times all new filters from different places so that I didn't get a bad air filter. What is the take???? I hate to take it to some one for a simple fix but it is getting close to a go time. Help. I have not a clue any more and am pretty mechanically inclined.