(Login rea98d) Member from IP address 184.108.40.206
I have a 1978 Grand Marquis with a stock 400 that needs 5 minutes to warm up before the motor will stay running without my foot on the gas. There's a bit of surging, as the idle speed goes up & down. On the down, it usually stalls. Once the engine has run for a few minutes, it settles down and acts right.
I rebuilt the stock carburetor about 5 years ago, but the car went into storage right after that, and it probably has 100 miles on the rebuild. I replaced the spark pklugs, wires, cap & rotor at the same time. Before the tune-up & carb work, it would ping on anything less than 93 octane gas. It now runs fine on 87. If I could get the cold idle sorted out, I'd be happy.
Any advice on what I need to tweak inside the carb to get it running right? I disassembles the thing, cleaned it, replaced all the parts that came with the rebuild kit and put it all back together, but I'm kinda new to the finer points of carburetor tuning. (I do want to learn, though. From what I've read, new jets, a new power valve, and more ignition timing can unlock quite a bit of power in a stock 400).