[otis-larry]

I Put A Jegs Engine In My Truck The 290hp They Sell For 85 And Older Chevy. I Have 700r4 Trans Truck Does Not Want To Idle Good With Ac On. I Think It Is Stock Converter That I Have. Do I Need Diff Converter To Make Truck Idle. Have Had It In Couple Shops Still Not Right. Truck Wants To Move While Sitting At A Stop When In Gear. Do I Need Some Kind Of Stall Converter Thanks

[Johnunit]

Originally Posted by otis-larry

I Put A Jegs Engine In My Truck The 290hp They Sell For 85 And Older Chevy. I Have 700r4 Trans Truck Does Not Want To Idle Good With Ac On. I Think It Is Stock Converter That I Have. Do I Need Diff Converter To Make Truck Idle. Have Had It In Couple Shops Still Not Right. Truck Wants To Move While Sitting At A Stop When In Gear. Do I Need Some Kind Of Stall Converter Thanks

Wanting to move in gear is normal for most automatic transmission vehicles.

We need more information about this vehicle, but if it's AC related I'd suspect either too low an idle in general (dragged down too much by the drag of the AC) or a problem with the AC system itself. Generally speaking the effect of the torque converter is minimal. A "higher stall RPM" converter will only come into effect while applying throttle. Even a stock truck converter "stalls" at higher than 1100RPM, and therefore isn't affecting the engine noticeably at normal idle rpms, which shouldn't by above 800rpm unless you're running a more radical cam than you'd need for 290hp out of a 350.



Oh and one friendly piece of advice: Typing With Every Word Capitalized Is Very Difficult To Read.

[otis-larry]

dont have a tach but it seems like it is idle pretty high , when you put it in gear it jumps so hard sometime back tire squeal on payment, Had shop put on new ac kickdown and check ac out. but after running in traffic it will stall at red lights motor has maybe 4000 miles on it. has all new wires plugs new dist new holley carb 570cfm. Thax for info on using all cap. have 342 posi gears

[T-bucket23]

You need to get the idle to 600-800 in gear. If you cant accomplish this you need to find out why. What is the vacuum reading at idle.