MISFIRE 1 AND 4

I checked the air gap between the crankshaft position sensor and the tips on the toner ring on the balancer, they are all the same.

I have a 1994 Ford Escort GT w/ 1.9L engine & manual transmission. When engine has warmed for a couple of minutes it begins to miss badly. It seems when I accelerate slowly it is not as bad but gets worse as I increase pressure on the peddle. The plugs, plug wires, rotor and cap were replaced less than 5000 miles ago. I ran the motor and individually pulled each plug wire to see what reaction I would get for the cylinder. Each one effected the idle so it didn't appear to be electrical in nature. I have replaced the fuel filter recently and replaced the ignition switch. Help!

I will check the timing belt marks and see if I can borrow a compression tester. What is the best way to do a spark test?
Could the crankshaft position sensor be causing my problem? I keep thinking that the problem is electrical in nature since it was very intermittent for five months.

I was checking the timing belt marks last night and once I removed the crankshaft pulley (Harmonic Balancer) the crankshaft sprocket and the cam sprocket timing marks are both aligned correctly, according to my Chilton manual. The mark on the crankshaft pulley has moved. I have changed the timing belt on this car before and that mark was at the right place then. The way it is constructed the part that the serpentine belt runs on and has the timing notch on it is rubber mounted to the hub that is one cast piece that includes the toner ring and the keyed hole for the crankshaft. I don't see how the serpentine pulley slipping by an inch on the assembly could cause my problem since the toner ring is part of the solid metal hub.
I have an induction timing light and with the pickup unit on the #1 spark plug wire the timing mark on the camshaft sprocket shows the that it is firing to the left of the timing mark, before top dead center. Thanks for your continuing help.

I double checked and the timing marks on the crankshaft sprocket and the cam sprocket are right on. Is there any other way besides the timing belt to adjust the timing on this engine?

1976 Ford Escort

Ford Escort mk2 1976

It was running low on petrol and I started to notice it was running a bit worse so I filled it up with fuel and it ran normal
then after that it started to have a bad ass misfire

could you please help me thankyou

Its not fuel injected it is carburetted
is there anything else you can help out with
why it would missfire

thankyou

What are the odds that the computer is causing the problem?

If the pumps internal filter or the fuel lines behind the pump might have blocked causing low pressure?

I borrowed a compression gauge and found a major problem. Cylinder 1 shows 190 psi, cylinder 2 shows 185 psi, cylinder 3 shows 190 psi and cylinder 4 shows only 20 psi. I'm guessing that means a valve seat problem on 4, which I guess was causing my problem to be intermittent. Is the computer detecting this low psi and decreasing the spark on 2 and 4, or do I have multiple problems.