The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 78 Suburban surging then dies on long grade

geezer#99 · 08-03-2020, 11:29 AM

Who knows!
You could try plugging off the return line.

I learned to ignore what I saw in the filter. If it keeps running, it’s good.

I ran into a similar problem on a coworkers ford 302. Turned out the intake was cracked (corroded)and when it warmed up the problem would occur. The splash shield had filled with corrosive crap and rotted a hole in the intake. Weird stuff happens.

How’s your hot idle vacuum reading?
Using any oil?

You should post your video you mentioned.

08-03-2020, 11:29 AM	#54
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,516	Re: 78 Suburban surging then dies on long grade Who knows! You could try plugging off the return line. I learned to ignore what I saw in the filter. If it keeps running, it’s good. I ran into a similar problem on a coworkers ford 302. Turned out the intake was cracked (corroded)and when it warmed up the problem would occur. The splash shield had filled with corrosive crap and rotted a hole in the intake. Weird stuff happens. How’s your hot idle vacuum reading? Using any oil? You should post your video you mentioned.