i just bought a 2001 911 n/a it seemd to be missing pretty bad, i scanned it and it said it was missing on cyclinder 3 and 4. on hard acceleration it runs ver very good, on slow acceleration it is missing bad. what do you think is the problem? plugs, coils??? any help would be great.

 

how many miles?

 

59k

 

If plugs haven't been done, they are way overdue. Start with those first as they are the cheapest.