93 gmc jimmy 4.3 v6... egr problems

atxhardrocker23

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so i bought a 93 gmc jimmy ran it about 200 miles and when i started to stop it stalled out i started it and it has a bad idol up and down up and down.. so i took it to a machanic and he cleaned the EGR valve out and pit it back in.. so im driving it two days later and same thing happens again but now it wont even start. it has fuel and spark..what could it be???
 


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