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There are three kinds of 302s made from 1982-2001.
5.0L HO This engine was used in 1983-1995 Mustangs, Mark VII Lincolns, and some T-birds and Cougars. All Explorer 5.0L engines are 5.0L HO engines as well. They use the 351W firing order, 1-3-7-2-6-5-4-8. Except for the 1983-84 Mustangs, all of these engines are roller cam equipped. They use a reverse rotation water pump and front cover. The 1994-5 Mustang and all Explorers use a unique front cover and water pump.
5.0L Full Size Car This engine was used in 1982-1990 Crown Victoria and Grand Marquis. They use the 289-302 firing order, 1-5-4-2-6-3-7-8. Most of these cars are not roller cam equipped, however sometime in the early 1990s they started using roller cams but retained the 302 firing order. They use a standard (clockwise) rotation water pump and front cover.
5.0L Truck (except Explorer) These engines are similar to the Full Size Car engines, except they use different intake manifolds and camshaft profiles. They also use the 289-302 firing order, 1-5-4-2-6-3-7-8. They also began using roller cams sometime in the early 1990s. They use a reverse rotation water pump and front cover.
if you are certain that the wires have been replaced correctly then you could have a bad set of wires even though they are new this happens sometimes but it sounds as if the firing order is off check the engines timing to see if its still in time.
V8 351 351W 400 -FIRING ORDER IS 1 3 7 2 6 5 4 8 THEN YOU HAVE V8 302 330 359 360 361 389 390 401 460 475 477 534 FIRING ORDER IS 1 5 4 2 6 3 7 8. THIS IS YOUR FIRING ORDERS FORD HAD MANY V8 ENGINES.I PUT THEM ALL DOWN.YOU DID NOT TELL ME YOUR ENGINE SIZE.
Firing Order, Small Block & SVO
This is one of the most common questions asked by our Ford customers.
The firing order for the early 221-302 engines and the early 5.0
engines is 1-5-4-2-6-3-7-8. This is the firing order for all prefix
“31” cams and is the standard replacement cam for all early engines.
The later 5.0 engine and all 351 engines are designed to use the
1-3-7-2-6-5-4-8 firing order. This is the firing order for all prefix
“35” cams, and cams ordered for these engines should use this prefix.
Other than the firing order, the cams are identical. By changing the
spark plug wiring at the distributor these cams can be interchanged.