Low compression on cylinder 1 bad skip if you idle it up the skip will go away and also it runs fine while driving

Try spraying carb cleaner around the intake if idle increases it is a bad intake gasket. It also could be a bad plug/s, wires, or low compression in one of the cylinders. At higher idle a slightly lower compression cylinder is not noticeable but after warming up the idle drops causing the cylinder to have a misfire.

Low compression does not require head removal. Do a compression test on a cylinder, then squirt some oil in the spark plug hole. Do the compression test on that cylinder again. If the compression goes up then the rings are worn. P0303 is a misfire in cylinder 3. This lets unburnt gas into the catalytic convertor. The cat can overheat, melt and be ruined. If the check engine light is blinking don't drive the car. A misfire is either no gas, no spark or low compression. The quivering light can be from idle or failing alternator. Put the probs of a multimeter on the battery posts. Set the meter to volts dc. Start the car the voltage should be between 13 and 14.6 volts. Anything more or less points to an alternator problem.

Depending on the miles on it, Usually a missfire has to do with a bad spark plug or spark plug wires, If they never been changed, If it has verry high mileledge on it end was not maintained well, There could be low compression in a cylinder, That can cause it to run rough, Hope this helps you out,

Bad Fuel injectors,replace them....................

YOU NEED NEW SPARK PLUGS AND WIRES.REPLACE FUEL FILTER,CLEAN FUEL INJECTORS BY ADDING CAN OF SEAFOAM TO 3/4 TO FULL TANK OF GAS SEE IF HELP PROBLEM.IF ENGINE STILL MISSES YOU COULD HAVE WEAK IGNITION COIL AND LOW CYLINDER COMPRESSION.

any cylinder will run or miss fire if the compression is low there are a few reasons what can cause low compression they are a burned or bunt valve, bad rings, a cracked cylinder wall or intake/exhaust seats a burned piston or a bad head gasket a leak down test will be more specif on witch you one of the following u have.

Popping from intake is usually an indication of timing issue. Worst case issue, flat lobe on cam shaft but this is a constant. Check the timing first.

Have the module tested, and do a compression test to make sure its not a weak cylinder due to low compression, this car is listed here as a 1995 camaro which cant be but make no diffrence, remove module and test if it low compression then i would do a motor vac, this is a fuel system cleaning and decarbonizing, i ve had a few that other shop told them that motor neede rebuilding , itold customer to try a motor vac and it worked it had carbon build up on the valves keeping one cylinders valves from closing all the way. if driven too long the valves will get brunt and then its $$, hope this helps.

remove valve cover and check valve movement

if all valves have full motion then you have a bad set of rings

scan check egr valve make sure its working. check plug wires and vacuum hoses +pvc valve make sure its not stuck open.bad or dirty fuel injections.causes rough idling.if all is good do a compression test to check for weak cylinders or low compression.