Had a few dtc's yesterday, need some insight

[mspk2]

so yesterday my car drove great all day, usually the first sign something is about to go wrong lol, took off from a light and got on it in 2nd hard and when I hit 3rd the car fell on its face and started running like crap, check engine light came on and started flashing, luckily I was only a mile from my place so I eased it home and read the dtcs when my obd scanner. came back with a p0301 which is misfire on cylinder 1, and a p0660, intake manifold control circuit. I replaced the plugs even tho they looked fine and already had my coil under warranty so I swapped that as well. car started right up idled perfect again. it drives well but when I start to roll on the throttle and it gets up around 4k it stumbles and jerks... any ideas?

 

[The_big_dill]

The P0660 is your VICS solenoid being broken.

Missfire could be w number of things, considering you have it under heavy load, I would assume you have bad gas. If you accelerate hard when it's not all the way up to temp? What kind of gas did you use?

 

[mspk2]

car was well up to temp, had been driving for 30+ minutes already. gas was Texaco 93 octane, I normally use shell but we were going the opposite way so that was my only option. the light doesn't come on for the p0660 tho but its on the scanner

 

[Viralphrame]

Check your ignition coils and spark plug wires.

The poor idle/running and flashing CEL has happened to me twice. The first time it was a bad coil (I replaced both at the same time) and the second time a small gash in the plug wiring insulation was causing the spark to ground out on my valve cover.

Hope this helps.