Simons
Adventurer
Ok, so you might actually have a cracked or damaged spark plug that's misfiring or arcing. Strangely though at that RPM your EGR would be flowing but really shouldn't have an impact unless of course the engine is missfiring.... back to possible damaged spark plug. Pull the plugs back out and take a look for track marks down the side of the porcelain.
As far as ruling out a faulty/stuck open EGR, what I like to do is cut out a plate from sheet metal to block off the port. Just bolt the EGR back on top sandwiching the plate to the intake.
I think it's safe to say you don't have any significant vacuum leaks anymore. A vacuum leak would really only be evident at idle (unless it was HUGE), the rough running associated with a vac leak would disappear as soon as you open the throttle.
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As far as ruling out a faulty/stuck open EGR, what I like to do is cut out a plate from sheet metal to block off the port. Just bolt the EGR back on top sandwiching the plate to the intake.
I think it's safe to say you don't have any significant vacuum leaks anymore. A vacuum leak would really only be evident at idle (unless it was HUGE), the rough running associated with a vac leak would disappear as soon as you open the throttle.
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