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number 4 missed fire on 1999 Chevrolet Express 1500

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number 4 miss fire i already replace all the fuel injector and did a full tune up on the van and its still say miss fire on number 4 i need help
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(4) Comments
I'm assuming you replaced the fuel injector sypder. When you say a full tuneup, you mean plugs and what.
Based on what you have done a compression check on the effected cylinder would be the next step.