Engine runs rough in gear.

Check what's called the map sensor. Advanced auto parts can help with that.

i would check the crankshaft sensor or the camshaft sensor the crank sensor is on the side of the engine i believe the pass .and the cam is in back of the engine .on top

-Is the engine running fine...? If so possibly the idle is too low.
-Is the engine running rough...? possibly miss fired , blow valve or head gasket.


Good Luck


Mai

I'm not sure of engine liter size? How long since a tune-up? I always check for codes, even if lite isn't on. Some of the national brand auto stores will check codes for free, if there are any, just tell them your lite has been going on and off.
Use a gage and check proper fuel pressure. I can give you fuel pressure spec because I don't know liter size of engine? Some vehicles don't have Schrader valve on fuel rail, which makes checking fuel pressure a little awkward.
If you have electronic returnless fuel system, you have a fuel pressure sensor, hopefully on the fuel rail. The yellow wire should be for fuel pressure, engine idling, use digital multimeter on yellow wire. 3 volts = 43.75 psi. 2 volts about 20 psi less. 4 volts about 20 psi more, so you get the picture.
The basics for a rough idle, check for a leak of some kind, fuel--egr--vacuum leak.

Put the car in the darkest environment you can and with the engine at idle, look around the high voltage leads; plug wires, etc. I replaced my lousy leads after about 2 years.
If you have a multimeter, you may be able to isolate one or more bad leads by measuring their resistance. It should be ~7-10Kohms, mine were nearly open (infinite) on two.

could be a few things the start up could be the idle air control sensor (my first thought), the coolant temp sensor for the computer might be a secondary thought for the engine being cold if the computer thinks its warm. that would be the first 2 places i would start without a check engine light or code to reference

DO A LITTLE TUNE UP.CHANGE SPARK PLUGS.CHANGE FUEL FILTER.CLEAN FUEL INJECTORS.FILL FUEL TANK UP.AND ADD A BOTTLE OF FUEL INJECTOR CLEANER IN FUEL TANK.WHEN YOU DRIVE CAR AROUND.THE INJECTOR CLEANER WILL CLEAN OUT FUEL INJECTORS.IF CAR STILL RUN ROUGH IN DRIVE.YOU COULD HAVE INTAKE LEAK.

I have a 1999 ford escort 2.0, its got a miss on cylinder 3 and 4. I changed the wires and the coil pack but its still missing. When scanned I get code p1506, p0303 and p0304

run a fuel pressure test, if that checks out fine it may be a faulty coil pack or ignition control module

I would suggest going to Autozone and have them check for code or codes that might have occured,they will do it for free and diagnose what the problem might be. But anytime the check engine light comes on it has to do with your emission,possibly an oxygen sensor may have went bad,have them pull the codes and see what the prob is.