73-87chevytrucks.com

73-87 Chevy _ GMC Trucks => Fuel Systems and Drivability => Topic started by: Low87 on December 04, 2012, 02:25:07 pm

Title: 350 TBI stumbles low to mid range
Post by: Low87 on December 04, 2012, 02:25:07 pm

From idle to about 1/2 power (sorry no tach) the K5 will intermittently stumble like a hard miss or interrupted fuel delivery.  It's died twice on me at idle in gear or in reverse.

I've read that it can be anything from a $0.50 vacuum hose to a $150 EGR valve.  I stopped by the parts store and their code reader doesn't show anything (check light isn't lit).

Any ideas on how to ID the problem before blowing $$$ on a crap shoot of replacing parts?

plugs & wires ~9 months old
new vac hoses along the firewall a few months ago

Title: Re: 350 TBI stumbles low to mid range
Post by: bake74 on December 04, 2012, 07:17:29 pm

     There are ways of checking the egr valve to see if it just dirty or faulty.  The Internet is full of tech articles and video's.  that is where I would start.
     Have you checked for vacuum leaks ?

Title: Re: 350 TBI stumbles low to mid range
Post by: Captkaos on December 16, 2012, 02:06:03 pm

pull up on the EGR valve and see if it changes the idle?

Does your SES light work at all?  Jump the A and B ports in the ALDL with a paper clip with the ignition off it should flash 12 as in flash....... flash flash...