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what are the symptons on cars when fuel injector has problem?

my 99 firebird has service engine soon light on and sucks alot of gas and has lost power. New spark plugs didnt fix it and I noticed on old plugs that 2 looked less burnt than the rest.my car wasnt properly repaired when left front fender was damaged years ago so the computer will not read codes.Most of the time I can detect where my car is sick and needs attention but when it comes to pumps and injectors I’m lost.. Is it a fuel injector problem that may be the blame or maybe fuel pump? I replaced cata con. wks ago, new plugs, new coils so now what? Never used fuel inj cleaner but thinking it may be ok? The car has 126k on it.

It sounds like your injectors are dirty, or have carbon deposits on the tips. That will make the spray pattern go nuts! You may need to check the fuel filter as well. Take your car to a shop where they can check your fuel pressure, injector pulse width, and clean your injectors. I’d think about replacing that computer as well, it’ll save you trouble down the road.
Readers Digest version: Fuel injection Systems
You have: high pressure fuel pump, filter, injector fuel rails,fuel pressure regulator, and return line to gas tank. Computer controls fuel pump, injector pulse width (time injector actually fires),and adjustments based on engine load factors for injector timing, and pulse width. Fuel not used by injectors is returned to fuel tank via return line.
Good luck, and hope this helps!

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