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73-87 Chevy _ GMC Trucks => Performance => Topic started by: rogue2187 on October 20, 2014, 12:49:23 pm

Title: Sputter on acceleration.
Post by: rogue2187 on October 20, 2014, 12:49:23 pm

New to the forum and just picked up a 1985 c10. It had a rebuilt 350 in it. When I first accelerate it sputters but then takes off fine. And after I get past initial takeoff it runs just fine. I've checked the carburetor for vacuum leaks and set timimg, not sure if I went high enough. I set it at 8° and it sounded well. Anything else I should check? Thanks in advance.

Title: Re: Sputter on acceleration.
Post by: rich weyand on October 20, 2014, 04:29:58 pm

Move the vacuum advance (has the 85 got one?) from ported (timed) vacuum to manifold vacuum.

You can set the timing higher, 12* BTDC at least, probably 16* BTDC.  If it pings when loaded (up a steep hill from a stop, for example), then back off two degrees.

Title: Re: Sputter on acceleration.
Post by: FlatBlack77 on October 20, 2014, 10:34:36 pm

are you setting the timing with the vacuum advance disconnected AND capped off?