Hi guys I'm new to forum. I just bought a 95 4.0 ranger a couple weeks ago. The guy I got it off of said it was idling choppy and he ran the codes on it and it came back bank 1 too lean. He said he replaced the MAF. Well it's been fine until today my battery died because I just put subs in it and wired the amp to the wrong fuse so it stayed on all night. Anyways I charged the battery and it started idling really choppy I had to stay in the gas if it would drop below 1500 Rpms it wanted to die. So I took it for a short drive and everytime I put it in drive or reverse i had to put it almost to the floor to keep it running. It almost seems like a fuel problem to me.

Just wanted to see what y'all think it could be.

Disconnect whatever you connected and see if that works.
Check to be sure you didn't leave a wire disconnected from the battery or have a bad connection.
Is the alternator charging ?

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2003 Ranger XL 2WD AT with a 4.0 from a 2010 Mustang (61,000 mi) new 03 ranger injectors
Rebuilt the 8.8 with Richmond 4.10 gears, Timkin bearings and rebuilt the Trac-lok, 245/70/16 Michelin-X Radial LT2
18 mpg, all city driving. 03 Rangers don't have egr.

Ok it's idling fine now but only when the heater is on. If I turn the heater off it IDles down and shuts off. Anyone got any ideas?

You've got an electrical problem. Check all the ground points.

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2003 Ranger XL 2WD AT with a 4.0 from a 2010 Mustang (61,000 mi) new 03 ranger injectors
Rebuilt the 8.8 with Richmond 4.10 gears, Timkin bearings and rebuilt the Trac-lok, 245/70/16 Michelin-X Radial LT2
18 mpg, all city driving. 03 Rangers don't have egr.

Check the groung on you driverside fender.

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97 ORIGINAL
4.0 XLT Reg Cab Manual on Manual Transfer
Best truck I've ever owned.

Ground on the fender is good.

Have you changed the air idle control?

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97 ORIGINAL
4.0 XLT Reg Cab Manual on Manual Transfer
Best truck I've ever owned.

I have a 95 (original owner though) and I was having a problem with my idle. I replaced the idle motor and the egr sensor and was still having a problem. Turned out that I still had original spark plugs and wires. Replacing those helped as did replaced the vacuum lines. You might want to have a look at your wires and hoses. If there are some old ones on there, that is going to be your problem.

Check your intake gasket. Mine had the same problem

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97 B4000. Auto. Leaf sprung Dana 30 Swap. Lots more to come!