If you are mechanically inclined, you can fix a lot of those problems yourself. Replacing the AOS and spark plugs will probably solve most of your misfiring problems. Those parts will set you back a whopping $230 and take you a Saturday to do.
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2003 Boxster S
1991 BMW 318is
'93 Ducati 900SS
'76 BMW R75/6
'73 Honda Scrambler
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