My 97 silverado loses spark at1800 rpm in cyl 3

Very likely a low fuel pressure problem. Have you changed the fuel filter? Check the fuel pressure against vehicle spec's while running at idle and again at about 3000 RPM. Also check pressure with key on/engine off. If you lose pressure between idle and higher RPM's you probably have a weak fuel pump. Same goes for if you lose pressure after initial key on/engine off. You could also have a problem with a weak ignition coil, spark plug wires or spark plugs but not as likely.

check and make sure the powrr wite has a solid cconnection the check the grounds to the starter.

scanning would be the next requirement to get an accurate diagnoses

take the head off bent valves thats for sure

2000 dodge ram 5.9 intake backfire at1800 rpm. only 1 time here and there

run engine codes, had same issue once before it was bad computer good luck

jus poke yourself in the bum really hard.

Back of Engine

#8 cly #7 cyl


#6 cly #5 cyl Firing Order IS

#4 cyl #3 cyl 1-8-7-2-6-5-4-3

#2 cyl #1 cyl

Front of Engine

A Very CRUDE But Eficiant Diagram of Your 5.3L Engine and its Cylinders LOCATION'S In the ENGINE. #5 Ignition Coil is on Driver Side of Engine and is the SECOND ONE FROM THE REAR OF THE ENGINE.THIS is TRUR AND CORRECT IM POSSITIVE !!
P L E A S E Remember to RATE ME Myst folks do not bother to RATE US

You are mis fireing on cyl 1 and 3 if you replaced plugs and wires and coil this is going to be a fuel injector issue or valve issue. See if you can swap the injectors with known good cyl. and see if it changes. Or have a shop do a fuel injector service on it to see if it helps. It may be to late for the fuel injector service.

1. adjust engine timing
2. change spark-plugs
3. 14 y.o. cars may have trouble in their high tension wires, change it