on a 97wrx when starting from cold it apperes to run on 3 cylnders and the idle is very rough when car has warmed up but after a long run at motorway
speeds this problem goes away then starts again after 10 mins or so of town driving.Parts changed plugs,ht leads,coil (one in the center with ht leads coming out of it) .maf ,lamber sensor any info will be much appretiated the car only does short jurneys £20.00 of fuel lasts about 2 weeks car has 108.000 mls on

chris

 

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any one have a clue please prity please

 

Have you checked the ecu for fault codes?

 

no never thought about that how would i go about doing that