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spray some starterfluid in there see if ur getting gas. check ur plugs and gaps. cap, rotor if none of that it may be a coil pack or the ICM a way to check the coil pack is to remove one of the spark plug wires from the cap an rotor an hold it close but not tuching the cap and turn it over to see if there is a spark if so that means the coil is good
On GM inline engines,cylinder #1 is the one closest to the front(pulley)end of the engine. If you pulled the wires off the distributor/coil pack,and don't know where they go,put one wire one at a time and crank it.If it doesn't backfire,repeat until it starts.(this is only easy on 4 cylinder or smaller engines)
You should be fine using a platinum plug. You can purchase from any auto parts store. Without the engine type I can't give you specfic pricing but on average they should be about 3-6 dollars each. There is no need for double platinum or irridium plugs on your vehicle.
if its only missing at low rpm, then I would think the problem is electrical. try replacing the spark plugs and the plug wires and the wire from the coil to the distributer, and make sure the plugs are gapped properly. that will probably solve your problem.
Haynes manual shows this for that problem, but please take it with a grain of salt and dash of peper:
1. Idle speed incorrect 2. Fuel filter clogged or water and impurities in fuel system 3. Distributor components damp or damaged 4. Faulty emissions system component (talk about vague :) 5. Faulty or incorrectly gapped spark plugs 6. Faulyt spark plug wires 7. Vacuum leak in intake manifold or vacuum hoses 8. Valve clearances incorrectly set
That last one is possible IF the new timing chain/belt was installed a tooth off.
All info is from a Geo Metro/Sprint Manual, but it may help.