I have a P0113 /P0300 P0301 P0302 P0303 P0304 CODES

Well i havea 1999 S10 2.2L 2wd Auto 123k miles got these codes during the start of the prob im not geting the P0113 no more after i reset the computer im get P0300 P0301 P0302 P0303 P0304 CODES all the time now i have changed the spark plugs and a Cool temp sensor the one on the Coolant Tube after i changed that it run fine and started fine for like 2 days so far the one on it all started after i changed my valve pan gasket it ran good for a couple days then started missing but for the last week i can't even drive it really when i start it it's very very very rough runing if i set and let it run like that and the motor warms up it runs fine and drive fine but when i go to restart it ever morning it runs rough and has random missfires please help me please i can't get to work and my boss is very mad i can't afford to go out and buy a load of parts and change them all at once i need some answers please and i notice this if im going up a hill and i give it some more gas it's like it loads up and back fires through the thottle body at times

Check your compression and fuel pressure also check vacuums and egr valve and also take the valve cover and see if you have a broken valve or a valve spring

Yeah i'll do that tommrow any one know what the compression and fuel pressure should be for my truck and if anyone would know really were the EGR valve is and how you would know if it's bad!! please help