my sho too slow

[luigisho]

Like the heading says my sho is too slow most of the time. I've had this problem for like 6 mos. I think the problem is centered around cylinder #3? The rear bank driver's side. Anyway, the car frequently feels like a regular taurus most of the time i.e. accelerates like a dog. I don't think there's oil in the plug wells since I checked it a few weeks ago and this has been a long running problem (I'll check again just to be sure). Last time I changed the plugs (july) it ran great for a short time (20-30 min.) and then after I shut it off and restarted it 10 min. later back to slo. Changed the #3? plug and ran great again only to slow down again after a brief time. In the last 6mos.I've replaced the O2 sensors, vss, injectors (sho shop used&flow tested), fuel pump,fuel filter, and cleaned the iab,maf,and act sensor.I feel a 60k coming up soon and would like to be able to solve this thing while it's opened up. Anybody have any ideas???

 

[jthomas68]

If your having a problem like the with a plug,there is a problem with that cylinder.Is it oil fouled(black)?

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Jeremy Thomas
Modified 91+
Pic Of The Week:

 

[luigisho]

I've been running around all day and haven't been able to check the plug. I'll def. do it tomorrow. I had a rebuild done this summer so I think a new piston ring was put on. However I don't take anything for granted because a good sho mechanic is really hard to find! I thought that all the seals would have been replaced too, but when I swapped out injectors the rubber seals that go to the heads were rotted big time. After the car wound up sitting for 2 weeks it ran like a champ again for a short time. Must be something fouling the plug that had a change to dry/evaporate? I'm guessing valve seals? guides? or piston ring? What would oil on the bottom of the spark plug tell me? How about gas? Thanks...

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1990 sho
sho shop y-pipe
k&n panel filter
coming soon: udp's and sfc's