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Old 09-20-2012, 11:55 PM   #7
Scooby Newbie
Member#: 281987
Join Date: May 2011
Location: Philadelphia pa
2007 wrx


i strongly suggest a compression check and if good then a leakdown test.. My 02 wrx acted similarly when piston #4 had a cracked ringland. I changed plugs, swapped coilpacks, cleaned grounds, cleaned maf, but rather than waste $ i just swapped the coilpacks to see if the miss went from cyl 4 to another and when it didnt i did a hot compression check to find only 90psi in cyl 4. Also, if cyl 4 is missing then you will most likely wipe out rod bearings in cyl 2, i did.. Its a horrible feeling to find that a rebuild is whats needed, so have some ginger ale handy to calm that sick stomach!!
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