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Help!!! 1995 258 Vista with a new 351 long block (5.8L) runs great above a Idle, but when at a idle it goes up & down, then stalls... Checked for vacume leaks with no luck... Changed the Map sensor, throttle bypass, & throttle position senser with no luck.

what kind of spark plugs you running? Have you checked them?

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2001 328 Vista "Nauta Dream 2"
AB Inflatable 10AL "Little Dreamer"
2000 248 Vista
1997 225 Sundowner


Mike

What are the timing settings?

Is the fuel injection standard or aftermarket?

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2006 Four Winns 278 Vista.
Volvo Penta 8.1L, Duo Prop,
Kohler 5E Generator.

had a similar problem two years ago on the 298 vista. The fuel pump needed to be replaced, issue on came when engine was under load, no issue when idling.

Hey there, had the same symptoms last season and it ended up being the engine temperature sensor. You have two on that engine, one is for the dashboard gage and the other is for the computer. Change the one that feeds temperature info to the computer.

Vacuum leak. With motor at idle vac pointer should hold steady between 16 and 22. If the intake manifold gaskets are leaking (usually) now's a good time get an upgrade intake manifold!

Something like
http://www.summitracing.com/parts/EDL-3887



Personally, I really like this intake
http://www.paxtonauto.com/product.php?id=101

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1981 Columbia 8.7
2015 Yamaha FZR - 87mph - sold
2006 Yamaha GP1300R - sold
2003 Chaparral 215 SSI - sold
2009 Stingray 195CS - sold
2000 Four Winns H180 - sold
1976 O'day Daysailer II - sold
Rick's Four Winns H180 Mods/Upgrade Thread