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Ho (high Output) Motors, available in mustangs and Lincoln mark VII are very similar same size engines that are sometimes swapped into panthers. They have different internals and heads. perhaps...

After simple check of Map,

Does it backfire through the intake?

Check the throttle base setting.
Check firing order is NOT HO.
Make sure ECM is NOT HO.
Are you 100% sure the engine is not an...

Sounds like you are on the right track the gas to bowl should shut off when the float rises.

It would be typical for the engine to run worse when this in unplugged so I suggest trying that.

IIRC it could be a vacuum leak, bad harness or bad sensor.

On another concern, the car does not...

Does that thing have a map?

just got these in.

A pleasant surprise at the top of the picture!
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Even the old holley single barrel 1910's had a small inspection cover in the top of the bowl that let you measure the correct height by sticking a ruler in the hole.

How does it run when not trying to idle?

Wound up ordering a set of the Stabilus as it was the cheapest, of Stabilus, Strong Arm & Tuff Support with shipping to me on Rock Auto which seems to have very good prices on these items.

Also It...

The quadrajet will do it also. More common with manual fuel pumps to have a gasket failure and fill the crankcase right up.

Bad carbs can run a lot of raw fuel into the engine diluting the oil. If you still have a sense of smell pull the stick and smell the oil, you might be able to smell gas.

The hood struts on the 03 must go to their final resting place.

I know there have been several mentions of replacement struts but I think they were kind of scattered in miscellaneous threads.
...

https://newyork.craigslist.org/wch/pts/d/yonkers-2005-lexus-ls430-electrical/7498423344.html

And vacuum need to be strong enough

Yes all lines need to be checked. And the check valve and can.

Lisle 75000 pump is good quality made in Brazil now. Sadly the mityvac has been made in China for quite some time.

Just to add to the above I used epoxy to fix the rusty can. Also one thing that fooled me was the vacuum line to the can was collapsed so it checked out no leaks but would not transmit vacuum.

Yes Lisle quality. Some years ago, before I swore off Harbor Freight I bought their scope. The first time i used it one of the ear pieces came off and was lost then I cut the inside of my ear as...

And when aligning wires don't forget the required crossovers to minimize misfires.

the gears are almost certainly degraded. Someone makes/made brass replacements but I can't remember who or where.

https://www.hemmings.com/auction/2003-mercury-grand-marquis-278684?utm_medium=email&utm_source=daily_marketplace_test513

And the neighbors think I'm nuts when I give the backs a quick hit with Ajax and a scrub brush.

What I really like under the hood is that it all would pass for stock to someone not familiar with these cars aside from the plate on the intake, the valve cover script and the radiator cap!

On much older cars the cruise symptoms you experience were all due to vacuum problems

Most likely tank cap or the overflow hose leaks air or the overflow tank itself has a crack. cracked tank took me some time to find a long time ago.

You don't happen to have or be able to borrow,...

:popcorn: