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[over50now]

Know what EGR stands for, but bit stupid, what does the EGR do.   RPMs on tick over are right.
Been having probs with sluggish and chuggish under load.  Cruise at 70 good.  Going to replace fuel filter later.  Have just check plug wells all appears ok.
Having recently put new exhaust back box on 'cos had the hairy exhaust which was he start of chugging.
Have now pulled connector from the EGR, no difference in tick over, but still chugg or sluggish when throttle blipped. Multi-ram at front works.
Would EGR be blocked - can I clean it. Thanks guys

[Abiton]

EGR reduces combustion temperatures, to reduce nitrogen oxide emissions, and improve economy a tad, I believe.  There's a great explanation on here somewhere by Marks DTM, I think.

Alternative explanation of your trouble though...
Could the greatly increased back-pressure of the blocked tail-pipe have caused a pipe to bust in the secondary air system, now causing an air-leak via a non-perfect non-return valve?

[over50now]

Thanks Abiton. Will look up Secondary Air thingy.