Engine turns over but will not fire

Could be low fuel pressure. Should be 50psi min.

Backfiring from intake usually indicates a timing problem. The brake job has not effect on the engine, unless you accidentally disconnected some wires in the engine compartment, but highly unlikely. More likely the timing belt/chain may have jumped a few teeth. If you have an access hole to see the timing belt and marks have a look. If you need more specific info most libraries have subscriptions to online automotive service manuals for almost any year, make and model of car, motorcycle, or whatever. If you have a library card, some will give you the u/n and p/w so you can access them from your home computer, if not then you will have to go to your local branch to get access, but it is free!

Security. Turn the key to run. Let it sit for ten minutes, off for thirty seconds. Then try to start. Do this three times for a relearn. Don't try to start.

have the fault codes read
could be a crank/cam position sensor or an immobilizer problem

98 chev pickup s10 put gas in the gas tank drove it about 2days and the check engen light came on had it check mech said it was the gas cap replace the gas cap the light back on now what help

TRansmission went on the car you may have to buy a new transmission

you said it jump time twice .describe what engine doing .is it back firing loping or hard to crank.

battery and or charging system

you likely have a bad cap and rotor when the weather gets humid and or very cold moisture can get into the cap and cause a crossfire condition(firing on mulitple/wrong sparkplugs) and will prevent it from starting.My 1996 chev silverado has done this to me 2 years in a row on one of the coldest nite of the season and both times a cap and rotor fixed the problem.(the first time i bought the cheapest one I could find...not so cheap now though!)
Hope this helps!

this engine fuel pump prassurae low. it fuel pump celan. Your problem sovel