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rpmdiag, Tech and Instructor
Category: Chevy
Satisfied Customers: 7743
Experience:  Since 1975
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Getting multiple misfires, only about 70K miles on plugs,

Customer Question

Getting multiple misfires, only about 70K miles on plugs, wires, distributor and cap. Do not believe I've ever changed the coil but not sure about that. thoughts?
JA: How many miles are on the car? Is it a steady misfire? Or random?
Customer: 223K. It's off and on, sometimes not there at all. Has been chugging for about a month but got dramatically worse in the last week.
JA: What is the make/model/year of your car?
Customer: 97 chevy suburban, 5.7L
JA: Are you fixing your Suburban yourself? What have you tried so far?
Customer: I will be fixing myself. Was going to start with the cap and rotor.
JA: Anything else you want the mechanic to know before I connect you?
Customer: What is the name of the part/shaft that goes from the rotor down into the crankshaft?
Submitted: 8 months ago.
Category: Chevy
Expert:  rpmdiag replied 8 months ago.

Hi, I'm Ron and I will be helping you today.
Stand by for a moment while I prepare your answer.

Expert:  rpmdiag replied 8 months ago.

You need to check the complete ignition system including the plugs, wires, coils and CRANK sensor.

Also check for fuel pressure being too low with a gauge.

Thanks, Ron