Hey whats going on Ladies and Fellas.....

I'm getting all these codes after a tuneup....the car was running fine for about 5 days after the tune up...now its running like straight sh**....
Ive checked the voltage at all the injectors and the ohm's of each injecter...everything seems fine...i do have a few wires that are cracked from the heat but nothing major...i plan to get to fixing those today...also going to replace the spark plugs with Bosch since it has autolites in it...garbage plugs...yet it ran fine with them in ...so with a multiple misfire (P0300), and 3 injector signal(P0202-P0204) codes...what are my possible faults? things i should check into? OH and its a 2000 S80 T6...any help would be appreciated...Thanks!!

 

Okay here is an Update:
maybe you guys were just as stumped at all the problems i posted as i was....or not...anyways just to help anybody with the same or similar problems im going to post what i did to rectify the problems....
First i decided to go ahead and replace the wiring to all the coils...even tho i was getting injector related codes..i couldn't find any reason why they would be faulty...so i cut ..soldered and replaced all of the coil wires...to my surprise it ran extremely better...the only code i was getting was a P0303...misfire on cylinder 3...so i swapped coils from a different cylinder and the problem did not follow...so it ruled out the coils....i rechecked the wiring and all was well...checked the injector on the cylinder...all was well once again...

So like i said before it had Autolite double platinum spark plugs...so i went and bought some NGK iridium plugs...damn it if that wasn't the problem...all codes are gone...its idling and running fine now...so if your car has those heat worn and cracked wires...i would suggest getting those looked at and the quality of your plugs really count for this type of car....which im sure most of you already know....Now all i have to do is fix this annoying oil leak...i am going to replace the crankcase ventilation system...yet im still confused on where the oil on the top of the engine is coming from....i was told that its coming from the filler cap...but NOPE...not there ...yet it keeps filling up with all this damn oil....then its smoking from the back side of the engine...which is where im sure the oil is hitting the exhaust....yet im leaving puddles under the timing belt side of the engine....so if anybody has ANY feedback on where that leak could be coming from....it would be appreciated

 

I have a 2004 V70 with 118K miles, well-maintained.

Same codes: P0343 (Cam sensor), P0300, P0302 (misfire #2 cylinder), P0304 (misfire #4 cylinder), P0202, P0202 (#4 fuel injector circuit)...
Engine stumbles and difficult to maintain idle etc.

As it turned out, the squirrels or some rodents chewed the ground wires.
Fixed the ground wires, engine is back to normal.

I am posting this in case others find it useful...