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rough idle,low vaccum


hcm1957
05-15-2012, 05:20 PM
I have a rebuilt 350 270 hp engine. Original quadra jet rebuilt and runs rough. Have low vaccum. Help
maxwedge
05-15-2012, 07:45 PM
Wow pretty general. vacuum leaks obviously, valves too tight, timing wrong, for starters.
danielsatur
05-15-2012, 07:52 PM
Do a smoke test to pinpoint any vacuum leaks.
hcm1957
05-20-2012, 12:22 PM
Timing is on, Lifters are adjusted correctly and no vacuum leaks around intake.All vacuum lines are plugged. still have rough idle and can not adjust idle mixture screws
maxwedge
05-20-2012, 02:35 PM
Compression test next. Or short out one wire at a time see if one cylinder does not change the engine speed or roughness.
DeltaP
05-20-2012, 03:37 PM
My 2 cents: Faulty or incorrect PCV valve or hoses. Poor valve seating. Restricted idle passages. Bad coil. This is in addition to everything else mentioned.
hcm1957
05-20-2012, 06:00 PM
Thanks for your 2 cents. All new hoses and pcv, heads where redone and running hei.

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