how to fix miss

1997 CHEVROLET SUBURBAN
180,000 MILES
Avatar
BIGSA
  • MEMBER
  • 1 POST
5.7 vortec is missing alot going up mountains then runs ok back and forth up long grades. misses on flat to but not as much .runs like a champ one min .then like a dog the next.
Oct 2, 2011 at 8:40 AM
Advertisement
Avatar
HMAC300
  • ✓Experienced Mechanic
  • 48,601 POSTS
check your fuel pressure and do all electrical ignition checks. this can be low fuel pressure as well as electrcal or injector. if you have csi type fuel devlivery then it should be 60-66 psi. if you have sfi(port fuel) then it should be 56-62psi. if it's beleow those levels that may cause your problem.
Oct 2, 2011 at 11:13 AM
🔧 Tools & Auto Repair Parts
Find automotive tools, diagnostic equipment, and replacement parts for your next repair.
Shop on Amazon →
Paid affiliate link. As an Amazon Associate, we earn from qualifying purchases.
Add a reply
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.

Ask a new question

Frequently Asked Problems for This Vehicle