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Ask GM Tech (Cam) Your Own Question
GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 15201
Experience:  GM Grand Master Technician 2007. 14 years experience.
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My 1999 chev suburban's 5.7 vortec v8 shows a misfire on

Customer Question

my 1999 chev suburban's 5.7 vortec v8 shows a misfire on cylinder 5. have read that there may be a defect in valve guide that causes the misfire. only happens under load in third gear. what do you know about it?
JA: How many miles are on the car? Is it a steady misfire? Or random?
Customer: 185000. only when you try to accelerate in third gear as in passing. small miss when idling
JA: Are you fixing your Suburban yourself? What have you tried so far?
Customer: no. have replaced fuel filter
JA: Anything else you want the mechanic to know before I connect you?
Customer: no, thanks
Submitted: 6 months ago.
Category: Chevy
Expert:  kalamykid replied 6 months ago.

Have you pulled the spark plug out to see what it looks like?