What will cause my 2007 CTS Cadillac diagnostic test keep saying plugs 1 and 3 when I had 1st a complete tune up and I've changed 1 and 3 twice the engine light is on it flashes when I press the gas

Asked by Jul 23, 2017 at 05:00 PM about the 2007 Cadillac CTS 2.8L RWD

Question type: Maintenance & Repair

Car misfiring had complete tune up had to
go back diagnostic test said 1 and 3 had
them changed now engine light is on and
flashes especially when I press the gas
took it back and it's still telling me 1 and
3. I'm a disabled female on a tiny monthly
income. I can't afford this please help me
with a solution.

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