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Had a bad stumble at idle and accelerating! on 1999 Chevrolet Tahoe

Enthusiast 01be16a5a93688912f14755221fb15211b518d9a788cf01b455e03cc1bd585ac
Had codes 300 & 307.changed plugs,cap,rotor,coil.wires are ac delco and only year old. No help. Then found out it had bad injector. Had the spider type. so put in the new mfi injector. This helped a bunch. But still has just a very little stumble at idle and giving it gas. 161000 miles.I think its just old and things worn out!
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