I have a pretty severe misfire on cold. Running good at warmer temps. I have P0171 & P0174 codes coming up. I had similar problem with a coil pack on an older lumina.
JA: Sometimes things that you think will be really complicated end up being easy to fix with a Chevy. The Chevy Mechanic I'm going to connect you with knows all the tricks and shortcuts. Tell me a bit more about what's going on so he can help you best.
Customer: It starts up fine but it wants to sputter and almost die when I press the throttle. I smooths out when I let off until it is warmed up. Seems a little sluggish at normal temp but not sure. This is a 2000 Silversmith with 4.8L engine
JA: Are you hoping to fix this yourself?
JA: Great! What have you tried so far?
Customer: I replaced the MAF and this helped for a week or so but now I am have same problem again.
JA: Is there anything else important you think the Chevy Mechanic should know about your Chevy?
Customer: Not that I can think of.
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Chevy Mechanic about your situation and then connect you two.