what would cause my 1994 GMC 1500 sierra to not start after oil change

Oil change would not cause this,is truck firing,getting fuel,im throwing bones,

It was running rough before the oil change, he changed it today & now the truck won't start at all.

Oh, & the check engine light is on, threw a code (I can't remember the numbers) but i believe it was for the ECM & or Spark Control Failure. Any ideas?

Check,main fuse,then check for firing,pull a spark plug wire,turn over see if you get spark,if spark is there check fuel relays.

If that fails repost and will go futher with it

Ok I will tell him to do that, he will have to do it tomorrow as it's already 9pm here in Cali, but if it doesn't work or I/we need more help I will be back, lol thank you so much for your help so far

Ok I sure will, talk soon :)

Is that by chance a vortex engine?

Hmmm, not sure, let me ask him

He doesn't think so

If it turns out that it is. Don't spray anything in the breather like gas or starter fluid to try and start it. Cause if you do and it backfires out the intake you will be replacing that to cause they are plastic.

No it's not a vortex after all

Agree with dandy

Ok I just talked to my other son (his twin brother) who was with him today, he said the alternator, belts etc were spinning but the motor wouldn't start

Ok that's great. Just had to throw that out there. Do as stated by topshadetree . Check for fire, fuel and air. The one that's missing will lead you to your solution. Good luck and keep us posted.

It is a fuel or spark problem,just got to narrow it down

1994 - I am leaning to possibly a fuel pump issue if it's never been replaced. Also have them check for anything that might have come unhooked while they were working on it.

True

Ok You guys are Awesome thank you so much!!! They will be doing this tomorrow & I will be back to keep you guys posted, thanks again for all the help so far... :)

what happened then? there is no follow up herein on the resolve...I'd bet it was a matter of combination issues...poor wiring and fuel connection?

Need help, I have a 94 gmc it is not firing at all what could cause this